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Revenue From Contract With Customers (Disaggregation of Revenue, By Product) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 356,346 | $ 392,615 | $ 1,129,823 | $ 1,047,834
High Power Continuous Wave ("CW") Lasers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 227,462 |  | 724,111 |
Medium Power CW Lasers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 15,825 |  | 65,092 |
Low Power CW Lasers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,276 |  | 10,380 |
Pulsed Lasers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 35,408 |  | 115,243 |
Quasi-Continuous Wave ("QCW") Lasers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 18,276 |  | 54,568 |
Other Revenue including Amplifiers, Laser Systems, Service, Parts, Accessories and Change in Deferred Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 56,099 |  | $ 160,429 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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