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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Contractors [Line Items] |  |  |
Deferred revenue | $ 102,673 | $ 57,051 |
Accrued loss provision | 2,813 | 1,483 |
Contract liabilities | 105,486 | 58,534 |
Changes in contract liabilities | 28,163 | $ 22,551 | $ (14,317)
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in deferred revenue | 45,622 |  |
Changes in accrued loss provision | 1,330 |  |
Changes in contract liabilities | $ 46,952 |  |

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