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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounts Receivable    
Contract receivables $ 113,572 $ 112,316
Contract retainages 60,694 56,053
Other 334 177
Accounts receivable, gross current 174,600 168,546
Less: Allowance for doubtful accounts (1,132) (1,305)
Accounts receivable, net current 173,468 167,241
Roll-forward activity of allowance for doubtful accounts    
Balance at beginning of period (1,305) (1,078)
Reduction in (provision for) allowances 159 (383)
Write offs, net of recoveries 14 156
Balance at end of period $ (1,132) $ (1,305)