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Percentage-of-completion method (Details 8) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 64,369 $ 58,243
Billings in excess of costs and estimated earnings on uncompleted contracts 68,048 47,011
Short-term retainage [1] 46,207 47,551
Long-term retainage [2] 1,605 1,053
Total retainage $ 47,812 $ 48,604
[1] Expected to be paid within one year or less and included in receivables, net.
[2] Included in deferred charges and other assets - other.