Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	$ 2,806,651	$ 1,897,106
Operating Income (Loss)	559,772	272,451
Other Income, Net	10,631	3,604
Income (Loss) Before Income Taxes	520,134	225,722
Total Assets	25,555,536		24,838,797
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	2,591,341	1,627,598
Operating Income (Loss)	530,951	209,886
Total Assets	22,112,317		21,313,158
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	88,070	115,963
Operating Income (Loss)	(38,584)	(19,436)
Total Assets	2,141,217		2,131,949
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	121,070	145,888
Operating Income (Loss)	77,213	91,200
Total Assets	1,001,172		1,085,664
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	6,170	7,657
Operating Income (Loss)	(9,808)	(9,199)
Total Assets	$ 300,830		$ 308,026