Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 102,114	$ 102,311
Income Taxes, Net of Refunds Received		49,565	247,494
Interest Costs Capitalized		23,000	28,000
Accrued Capital Expenditures		$ 777,000	$ 872,000

[1] Net of capitalized interest of $23 million and $28 million for the six months ended June 30, 2015 and 2014, respectively.