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Revenue - Contract liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Deferred revenue |  | $ 182,232 | $ 159,310
Accrued loss provision |  | 7,307 | 10,067
Contract liabilities |  | 189,539 | $ 169,377
Increase in contract liabilities |  | 20,200 |
Decrease in accrued loss provision |  | 17,900 |
Revenue recognized included in contract liability at beginning of period |  | $ 159,400 |
Willbros Group, Inc |  |  |
Increase in contract liabilities | $ 63,900 |  |

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