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Costs and Billings on Uncompleted Contracts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cost and Billings on Uncompleted Contracts [Line Items]      
Costs incurred on uncompleted contracts (gross) $ 42,993 $ 72,581  
Billings on uncompleted contracts (gross) (47,915) (80,152)  
Total deferred revenue (4,922) (7,571)  
Costs in excess of billings on uncompleted contracts 25 2,137  
Billings in excess of costs on uncompleted contracts (4,947) (9,708)  
Provision for loss on uncompleted contracts 200 800  
Other current liabilities      
Cost and Billings on Uncompleted Contracts [Line Items]      
Loss on contracts provisions $ 400 $ 300 $ 300