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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Contractors [Line Items] |  |  |
Deferred revenue | $ 134,194 |  | $ 155,570
Accrued loss provision | 2,793 |  | 2,826
Contract liabilities | 136,987 |  | $ 158,396
Contract liabilities, Change | (21,433) | $ 23,271 |
Change |  |  |
Contractors [Line Items] |  |  |
Deferred revenue, Change | (21,376) |  |
Accrued loss provision, Change | (33) |  |
Contract liabilities, Change | $ (21,409) |  |

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