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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
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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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

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