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, 2019
Dec. 31, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]      
Accounts receivable, net $ 95,863 $ 85,985  
Accounts receivable retainage, net 16,976 13,516  
Contract Assets:      
Costs and estimated earnings in excess of billings 202,243 86,842 $ 104,852
Contract Liabilities:      
Billings in excess of cost and estimated earnings $ 32,178 $ 30,706