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Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable.    
Contracts receivable, net of allowance for doubtful accounts of $480 at December 31, 2017 and $1,030 at December 31, 2016, respectively $ 286,113 $ 340,871
Retention receivable 66,586 46,394
Contracts receivable and retention 352,699 387,265
Other accounts receivable 5,476 735
Accounts receivable, net 358,175 388,000
Allowance for doubtful accounts $ 480 $ 1,030