Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 118,120	$ 102,114
Income Taxes, Net of Refunds Received		(10,997)	49,565
Accrued Capital Expenditures		$ 371,000	$ 777,000

[1] Net of capitalized interest of $17 million and $23 million for the six months ended June 30, 2016 and 2015, respectively.