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, 2019
Dec. 31, 2018
Jun. 30, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]        
Accounts receivable, net $ 109,332 [1] $ 85,985 [1] $ 115,596 $ 85,121
Accounts receivable retainage, net 15,383 13,516 14,669 17,484
Contract Assets:        
Costs and estimated earnings in excess of billings 120,686 [1] 86,842 [1] 64,656 95,658
Contract Liabilities:        
Billings in excess of cost and estimated earnings $ 30,209 $ 30,706 $ 27,254 $ 27,248
[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2019 and December 31, 2018 of $134,848 and $126,727, respectively. Includes non-recourse liabilities of consolidated VIEs at June 30, 2019 and December 31, 2018 of $40,217 and $34,684, respectively. See Note 12.