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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Contractors [Line Items] |  |  |
Deferred revenue | $ 75,641 |  | $ 57,051
Accrued loss provision | 1,652 |  | 1,483
Contract liabilities | 77,293 |  | $ 58,534
Changes in contract liabilities | (397) | $ 8,681 |
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in deferred revenue | 18,590 |  |
Changes in accrued loss provision | 169 |  |
Changes in contract liabilities | $ 18,759 |  |

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