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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Contractors [Line Items] |  |  |
Deferred revenue | $ 98,597 |  | $ 102,673
Accrued loss provision | 2,038 |  | 2,813
Contract liabilities | 100,635 |  | $ 105,486
Changes in contract liabilities | (4,697) | $ (30,033) |
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in deferred revenue | (4,076) |  |
Changes in accrued loss provision | (775) |  |
Changes in contract liabilities | $ (4,851) |  |

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