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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounts Receivable    
Contract receivables $ 112,316 $ 99,121
Contract retainages 56,053 28,299
Other 177 569
Accounts receivable, gross current 168,546 127,989
Less: Allowance for doubtful accounts (1,305) (1,078)
Accounts receivable, net current 167,241 126,911
Roll-forward activity of allowance for doubtful accounts    
Balance at beginning of period (1,078) (947)
Reduction in (provision for) allowances (383) (159)
Write offs, net of recoveries 156 28
Balance at end of period $ (1,305) $ (1,078)