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Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] All Trading Arrangements All Trading Arrangements [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Award Timing Disclosures [Line Items] Marketable Securities Investment [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Performance change (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Performance Change Represents the amount of shares related to a performance change related to equity instruments other than option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). 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Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Adoption Date Trading Arrangement Adoption Date Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Options exercisable, weighted-average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Long-term finance lease liabilities Finance Lease, Liability, Noncurrent Entity Central Index Key Entity Central Index Key Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Gain on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Stock-based compensation expense Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Gross Finite-Lived Intangible Assets, Gross Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Provision for income taxes Income Tax Expense (Benefit) Finance lease assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Accrued compensation Employee-related Liabilities, Current Fair Value Measurements Fair Value Disclosures [Text Block] Name Trading Arrangement, Individual Name Net current-period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Debt Securities, Available-for-Sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Inventory Inventory Disclosure [Text Block] Corporate Unallocated and Japan Corporate Unallocated and Japan Segment [Member] Segment for corporate unallocated expenses and Japan. Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Amendment Flag Amendment Flag Money market mutual fund Money Market Funds [Member] Injection Molding Injection Molding (Protomold) [Member] Represents the Injection Molding (Protomold) product. Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Financial Assets: Assets, Fair Value Disclosure [Abstract] Repurchases of common stock and other (in shares) Stock Repurchased and Retired During Period, Shares Certificates of deposit/time deposits Bank Time Deposits [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Diluted (in shares) Diluted - weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Operating expenses Operating Expenses [Abstract] Regulated Operations [Abstract] Purchases of property, equipment and other capital assets Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid-In Capital Additional Paid-in Capital [Member] Expired, weighted-average exercise price (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Cover [Abstract] Cover [Abstract] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition UNITED STATES UNITED STATES Fair Value, Recurring Fair Value, Recurring [Member] Other long-term liabilities Other Liabilities, Noncurrent Restrictions lapsed, weighted-average grant date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Non-NEOs Non-NEOs [Member] Total operating expenses Operating Expenses Segment Reporting Segment Reporting Disclosure [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Current finance lease liabilities Finance Lease, Liability, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Purchase price of common stock (in percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Basic (in shares) Basic - weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Income from operations Total Income from Operations Operating Income (Loss) Statements of Operations: Revenues [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Comprehensive Income (Loss) (net of tax) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Proceeds from exercises of stock options Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Line Items] Interest on finance lease obligations Accretion Expense Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Schedule of Nonvested Performance-Based Units Activity Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Debt Securities, Available-for-Sale Debt Securities, Available-for-Sale [Table Text Block]