Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers - Contract Balances (Details)

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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net (including amounts in VIEs of $374 and $328, respectively) $ 85,985   $ 85,121
Accounts receivable retainage, net 13,516   17,484
Contract Assets:      
Costs and estimated earnings in excess of billings 86,842 $ 104,852 $ 104,852
Contract Liabilities:      
Billings in excess of cost and estimated earnings 30,706    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net (including amounts in VIEs of $374 and $328, respectively)   85,121  
Accounts receivable retainage, net   17,484  
Contract Assets:      
Costs and estimated earnings in excess of billings $ 93,214 95,658  
Contract Liabilities:      
Billings in excess of cost and estimated earnings   $ 27,248