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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue |
Schedule of revenue by discipline |
|  |  | Year ended
|  |  | December 31,
|  |  | 2018* |  | 2017 |  | 2016
|  |  | (in thousands)
Systems |  |  | $ | 280,388 |  | $ | 262,688 |  | $ | 139,284
Aftermarket |  |  |  | 162,187 |  |  | 147,873 |  |  | 127,696
|  |  | $ | 442,575 |  | $ | 410,561 |  | $ | 266,980
Schedule of revenue by geographic markets |
|  |  | Year ended
|  |  | December 31,
|  |  | 2018* |  | 2017 |  | 2016
|  |  | (in thousands)
North America |  |  | $ | 54,790 |  | $ | 59,825 |  | $ | 49,864
Asia Pacific |  |  |  | 326,191 |  |  | 296,481 |  |  | 166,203
Europe |  |  |  | 61,594 |  |  | 54,255 |  |  | 50,913
|  |  | $ | 442,575 |  | $ | 410,561 |  | $ | 266,980
Schedule of contract assets and contract liabilities |
|  | December 31, |  | December 31,
|  | 2018 |  | 2017
|  | (in thousands)
Contract assets |  | $ | — |  | $ | —
Contract liabilities |  | $ | 22,584 |  | $ | 18,145
|  |  | Year ended
|  |  | December 31,
|  |  | 2018 |  | 2017
Revenue recognized in the period from: |  |  |  |  |  |  |
Amounts included in contract liability at the beginning of the period |  |  | $ | 12,845 |  | $ | 9,522
Performance obligations satisfied in previous periods |  |  | $ | — |  | $ | —

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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