Quarterly report pursuant to Section 13 or 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
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]        
Accounts receivable, net $ 115,462 [1] $ 125,010 [1] $ 86,017 $ 95,863
Accounts receivable retainage, net 36,485 30,189 19,119 16,976
Contract Assets:        
Costs and estimated earnings in excess of billings 195,027 [1] 185,960 [1] 195,391 202,243
Contract Liabilities:        
Billings in excess of cost and estimated earnings 26,561 33,984 34,896 26,618
Billings in excess of cost and estimated earnings, non-current 6,082 6,631 5,035 5,560
Total contract liabilities $ 32,643 $ 40,615 $ 39,931 $ 32,178
[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2021 and December 31, 2020 of $155,878 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at June 30, 2021 and December 31, 2020 of $32,318 and $33,335, respectively. See Note 12.