Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Interest, Net of Capitalized Interest	$ 186,546	$ 243,279	$ 275,305
Income Taxes, Net of Refunds Received	(291,849)	75,634	188,946
Accrued Capital Expenditures	612,000	592,000	475,000
Non-cash investing and financing activities from property exchanges.	$ 150,000	362,000	$ 282,000
Non-cash investing activities from other, property, plant and equipment		$ 49,000