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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Significant Noncash Transactions [Line Items]
Interest (Net of Amounts Capitalized)	$ 141,992	$ 143,111	$ 144,756
Income Taxes	(118,125)	(138,409)	(11,505)
Notes Received from Property Sales
Other Significant Noncash Transactions [Line Items]
Capital expenditures incurred, not yet paid	$ 30,982	$ 43,982	$ 58,246

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