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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Unbilled revenue | $ 129,850 |  | $ 111,153
Contract retainages, net | 58,219 |  | 49,128
Contract assets | 188,069 |  | $ 160,281
Changes in contract assets | 27,615 | $ 12,753 |
Net Period Change [Member] |  |  |
Changes in unbilled revenue | 18,697 |  |
Changes in contract retainages, net | 9,091 |  |
Changes in contract assets | $ 27,788 |  |

X
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