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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Contractors [Line Items] |  |  |
Deferred revenue | $ 138,180 |  | $ 155,570
Accrued loss provision | 2,134 |  | 2,826
Contract liabilities | 140,314 |  | $ 158,396
Contract liabilities, Change | (18,087) | $ (4,697) |
Change |  |  |
Contractors [Line Items] |  |  |
Deferred revenue, Change | (17,390) |  |
Accrued loss provision, Change | (692) |  |
Contract liabilities, Change | $ (18,082) |  |

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