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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]    
Accounts receivable, including retainage $ 26,979 $ (1,976)
Contracts in progress, net (17,954) (9,400)
Receivables from and equity in construction joint ventures (1,593) (905)
Other current and non-current assets 1,242 2,084
Accounts payable (14,421) (17,556)
Accrued compensation and other liabilities 888 2,602
Members' interest subject to mandatory redemption and undistributed earnings 183 (2,211)
Changes in operating assets and liabilities $ (4,676) $ (27,362)