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Stock Additional Paid-in Capital Additional Paid-in Capital [Member] Total Assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Cover [Abstract] Cover [Abstract] Change due to foreign currency translation Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Subsequent Events Subsequent Events [Text Block] Credit Agreement Second Amendment Credit Agreement Second Amendment [Member] Credit Agreement Second Amendment United States UNITED STATES Other long-term liabilities Other Liabilities, Noncurrent Vested (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 future minimum lease payments Lessee, Operating Lease, Liability, to be Paid Remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Short-term investments Short-Term Investments Construction in process Construction in Progress [Member] Intangible asset acquisition, consideration Asset Acquisition, Consideration Transferred Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Changes in contract estimates related to projects in progress Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Basic (in shares) Weighted average basic shares (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Operating income Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Non-Employee Director Equity Incentive Plan Non Employee Director Equity Incentive Plan [Member] 2014 Non-Employee Director Equity Incentive Plan Member Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Operating Activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Statement [Line Items] Statement [Line Items] Standard assurance warranty, period Standard Assurance Warranty, Period Standard Assurance Warranty, Period 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] Guarantee liability Guarantee liability Guarantor Obligations, Current Carrying Value Immediate Vesting Share-Based Payment Arrangement, Tranche One [Member]