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Supplemental Cash Flow Information - Net Effects of Changes in Operating Assets and Liabilities, Net, on Cash Flows from Operating Activities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]    
Accounts and notes receivable $ 122,330 $ (159,469)
Contract assets 16,372 5,267
Inventories (4,368) 28,996
Prepaid expenses and other current assets 84,078 (29,339)
Accounts payable and accrued expenses and other non-current liabilities (110,394) (66,678)
Contract liabilities (12,886) (23,380)
Other, net (5,662) (5,553)
Net change in operating assets and liabilities, net of non-cash transactions $ 89,470 $ (250,156)