Supplemental Cash Flow Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest (1)	$ 56,124,000	[1]	$ 53,547,000	[1]
Income Taxes, Net of Refunds Received	12,787,000		21,359,000
Interest Costs Capitalized	12,000,000		14,000,000
Accrued Capital Expenditures	$ 771,000,000		$ 867,000,000

[1] Net of capitalized interest of $12 million and $14 million for the three months ended March 31, 2015 and 2014, respectively.