Segment Information (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	$ 2,885,744	$ 1,582,075	$ 7,353,100	$ 4,310,736
Operating Income (Loss)	950,030	(11,695)	1,810,734	348,708
Other Income, Net	1,377	5,772	11,205	7,910
Net Interest Expense	52,186	32,890	153,772	88,215
Income (Loss) Before Income Taxes	899,221	(38,813)	1,668,167	268,403
Total Assets	24,794,678		24,794,678		21,624,233
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	2,640,739	1,359,896	6,549,392	3,603,758
Operating Income (Loss)	923,810	252,871	1,938,349	562,194
Total Assets	21,234,270		21,234,270		17,762,533
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	103,842	103,587	360,380	357,186
Operating Income (Loss)	(36,596)	(330,985)	(356,012)	(386,205)
Total Assets	2,186,128		2,186,128		2,598,412
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	134,542	110,904	421,884	328,900
Operating Income (Loss)	96,304	76,028	279,413	222,997
Total Assets	1,079,335		1,079,335		954,391
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	6,621	7,688	21,444	20,892
Operating Income (Loss)	(33,488)	(9,609)	(51,016)	(50,278)
Total Assets	$ 294,945		$ 294,945		$ 308,897