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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)

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