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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts Receivable.    
Contracts receivable, net of allowance for doubtful accounts of $1,093 at June 30, 2015 and $540 at December 31, 2014 $ 275,339 $ 287,806
Retention receivable 42,682 49,104
Contracts receivable and retention 318,021 336,910
Other accounts receivable 492 472
Accounts receivable, net 318,513 337,382
Allowance for doubtful accounts $ 1,093 $ 540