Quarterly report pursuant to Section 13 or 15(d)

Contract Assets and Liabilities - Components of Contract Asset and Liability Balances (Details)

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Contract Assets and Liabilities - Components of Contract Asset and Liability Balances (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Contract assets      
Costs in excess of billings and estimated earnings $ 39,898   $ 44,315
Retainage receivable 32,389   32,873
Total contract assets 72,287 $ 68,285 77,188
Change in costs in excess of billings and estimated earnings (4,417)    
Change in retainage receivable (484)    
Change in total contract assets (4,901) 4,476  
Contract liabilities      
Billings in excess of costs and estimated earnings 57,874   40,662
Provisions for losses 750   1,708
Total contract liabilities 58,624   $ 42,370
Change in billings in excess of costs and estimated earnings 17,212    
Change in provisions for losses (958)    
Change in total contract liabilities $ 16,254 $ (4,686)