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Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue |  |  |
Revenue | $ 442,575 | $ 410,561 | $ 266,980
North America |  |  |
Disaggregation of Revenue |  |  |
Revenue | 54,790 |  |
Asia Pacific |  |  |
Disaggregation of Revenue |  |  |
Revenue | 326,191 |  |
Europe |  |  |
Disaggregation of Revenue |  |  |
Revenue | 61,594 |  |
Systems |  |  |
Disaggregation of Revenue |  |  |
Revenue | 280,388 | 262,688 | 139,284
Aftermarket |  |  |
Disaggregation of Revenue |  |  |
Revenue | 162,187 | 147,873 | 127,696
Pro Forma Under ASC 605 |  |  |
Disaggregation of Revenue |  |  |
Revenue | 441,552 | 410,561 | 266,980
Pro Forma Under ASC 605 | North America |  |  |
Disaggregation of Revenue |  |  |
Revenue |  | 59,825 | 49,864
Pro Forma Under ASC 605 | Asia Pacific |  |  |
Disaggregation of Revenue |  |  |
Revenue |  | 296,481 | 166,203
Pro Forma Under ASC 605 | Europe |  |  |
Disaggregation of Revenue |  |  |
Revenue |  | $ 54,255 | $ 50,913
ASC 606 Adjustments |  |  |
Disaggregation of Revenue |  |  |
Revenue | (1,023) |  |
ASC 606 Adjustments | North America |  |  |
Disaggregation of Revenue |  |  |
Revenue | 200 |  |
ASC 606 Adjustments | Asia Pacific |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 1,300 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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