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Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable [Line Items]    
Contract receivables $ 159,794 $ 120,295
Contract retainages 27,474 38,379
Other 343 606
Accounts receivable, gross current 187,611 159,280
Less: Allowance for doubtful accounts (376) (1,179)
Accounts receivable, net current $ 187,235 $ 158,101