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Contract Assets and Liabilities - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contractors [Line Items] |  |  |
Deferred revenue | $ 155,570 | $ 102,673 |
Accrued loss provision | 2,826 | 2,813 |
Contract liabilities | 158,396 | 105,486 |
Changes in contract liabilities | 52,918 | $ 28,163 | $ 22,551
Net Period Change |  |  |
Contractors [Line Items] |  |  |
Change in deferred revenue | 52,897 |  |
Change in accrued loss provision | 13 |  |
Changes in contract liabilities | $ 52,910 |  |

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