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Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue |  |  |
Revenue | $ 342,958 | $ 442,575 | $ 410,561
North America |  |  |
Disaggregation of Revenue |  |  |
Revenue | 36,206 | 54,790 | 59,825
Asia Pacific |  |  |
Disaggregation of Revenue |  |  |
Revenue | 251,020 | 326,191 | 296,481
Europe |  |  |
Disaggregation of Revenue |  |  |
Revenue | 55,732 | 61,594 | 54,255
Systems |  |  |
Disaggregation of Revenue |  |  |
Revenue | 202,571 | 280,388 | 262,688
Aftermarket |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 140,387 | $ 162,187 | $ 147,873

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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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