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New Accounting Standards Implemented - Schedule of Contract Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
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Accounting Changes and Error Corrections [Abstract] |  |  |
Unbilled contract receivables, gross | $ 20,808 | $ 15,245 |
Retainage | 30,559 | 30,223 |
Total contract assets | 51,367 | 45,468 |
Less: current portion | 45,836 | 45,468 |
Contract assets non-current | $ 5,531 |  |

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