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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Deferred revenue | $ 27,065 |  | $ 57,051
Accrued loss provision | 1,454 |  | 1,483
Contract liabilities | 28,519 |  | $ 58,534
Changes in contract liabilities | (30,033) | $ (12,333) |
Net Period Change [Member] |  |  |
Changes in deferred revenue | (29,986) |  |
Changes in accrued loss provision | (29) |  |
Changes in contract liabilities | $ (30,015) |  |

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