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Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Contracts in progress $ 122,457 $ 121,666
Unbilled retentions 42,714 35,069
Trade receivables 103,554 113,380
Other receivables 383 1,102
Allowance for doubtful accounts (4,026) (3,619)
Total accounts receivable $ 265,082 $ 267,598