Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 46,897	$ 47,771
Income Taxes, Net of Refunds Received		15,066	(9,307)
Interest Costs Capitalized		9,000	7,000
Accrued Capital Expenditures		642,000	706,000
Non-Cash Property Exchanges		29,000	$ 62,000
Noncash From Other Property, Plant and Equipment		$ 49,000

[1] Net of capitalized interest of $9 million and $7 million for the three months ended March 31, 2020 and 2019, respectively.