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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Deferred revenue | $ 52,364 |  | $ 57,051
Accrued loss provision | 1,217 |  | 1,483
Contract liabilities | 53,581 |  | $ 58,534
Changes in contract liabilities | (5,035) | $ 17,551 |
Net Period Change [Member] |  |  |
Changes in deferred revenue | (4,687) |  |
Changes in accrued loss provision | (266) |  |
Changes in contract liabilities | $ (4,953) |  |

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