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Percentage-of-completion method (Details 8) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 60,828 $ 64,996
Billings in excess of costs and estimated earnings on uncompleted contracts 84,189 83,167
Short-term retainage 55,906 [1] 54,256 [1]
Long-term retainage 4,229 [2] 2,038 [2]
Total retainage $ 60,135 $ 56,294
[1] Expected to be paid within one year or less and included in receivables, net.
[2] Included in deferred charges and other assets - other.