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Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts Receivable.    
Contracts receivable, net of allowance for doubtful accounts of $1,129 at September 30, 2015 and $540 at December 31, 2014 $ 331,065 $ 287,806
Retention receivable 54,638 49,104
Contracts receivable and retention 385,703 336,910
Other accounts receivable 381 472
Accounts receivable, net 386,084 337,382
Allowance for doubtful accounts $ 1,129 $ 540