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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Contractors [Line Items] |  |  |
Deferred revenue | $ 126,446 |  | $ 102,673
Accrued loss provision | 2,256 |  | 2,813
Contract liabilities | 128,702 |  | $ 105,486
Changes in contract liabilities | 23,271 | $ (5,035) |
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in deferred revenue | 23,773 |  |
Changes in accrued loss provision | (557) |  |
Changes in contract liabilities | $ 23,216 |  |

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