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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
(Increase) decrease in:      
Accounts and notes receivable, net $ 138,388 $ 210,419 $ (40,632)
Contract assets 280,360 207,467 (83,774)
Other current assets 3,893 (80,248) 168,021
Other assets 109,405 100,527 (25,424)
Increase (decrease) in:      
Accounts payable (343,113) (46,873) 176,335
Contract liabilities (53,580) 202,359 (307,844)
Accrued liabilities (11,829) 29,880 (75,878)
Other liabilities (93,723) 9,496 (38,536)
Increase (decrease) in cash due to changes in assets and liabilities 29,801 633,027 (227,732)
Cash paid during the year for:      
Interest 65,641 71,938 66,514
Income taxes (net of refunds) $ 65,188 $ 204,080 $ (28,408)