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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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