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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue. |
Schedule of revenue by discipline |
|  | Year ended
|  | December 31,
|  | 2019 |  | 2018 |  | 2017
|  | (in thousands)
Systems |  | $ | 202,571 |  | $ | 280,388 |  | $ | 262,688
Aftermarket |  |  | 140,387 |  |  | 162,187 |  |  | 147,873
|  | $ | 342,958 |  | $ | 442,575 |  | $ | 410,561
Schedule of revenue by geographic markets |
|  | Year ended
|  | December 31,
|  | 2019 |  | 2018 |  | 2017
|  | (in thousands)
North America |  | $ | 36,206 |  | $ | 54,790 |  | $ | 59,825
Asia Pacific |  |  | 251,020 |  |  | 326,191 |  |  | 296,481
Europe |  |  | 55,732 |  |  | 61,594 |  |  | 54,255
|  | $ | 342,958 |  | $ | 442,575 |  | $ | 410,561
Schedule of contract assets and contract liabilities |
|  | Year ended
|  | December 31,
|  | 2019 |  | 2018 |  | 2017
|  | (in thousands)
Balance, beginning of the period |  | $ | 22,584 |  | $ | 18,145 |  | $ | 11,009
Deferral of revenue |  |  | 24,403 |  |  | 17,284 |  |  | 16,658
Recognition of deferred revenue |  |  | (17,736) |  |  | (12,845) |  |  | (9,522)
Balance, ending of the period |  | $ | 29,251 |  | $ | 22,584 |  | $ | 18,145

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