Segment Information (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	$ 2,570,250	$ 1,357,968	$ 4,467,356	$ 2,728,661
Operating Income (Loss)	588,253	140,501	860,704	360,403
Other Income, Net	6,224	(545)	9,828	2,138
Net Interest Expense	51,253	29,897	101,586	55,325
Income (Loss) Before Income Taxes	543,224	110,059	768,946	307,216
Total Assets	23,959,379		23,959,379		21,624,233
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	2,281,055	1,123,161	3,908,653	2,243,862
Operating Income (Loss)	804,653	118,453	1,014,539	309,323
Total Assets	20,309,529		20,309,529		17,762,533
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	140,575	113,560	256,538	253,599
Operating Income (Loss)	(299,980)	(42,778)	(319,416)	(55,220)
Total Assets	2,292,034		2,292,034		2,598,412
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	141,454	114,782	287,342	217,996
Operating Income (Loss)	91,909	74,942	183,109	146,969
Total Assets	1,058,853		1,058,853		954,391
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	7,166	6,465	14,823	13,204
Operating Income (Loss)	(8,329)	(10,116)	(17,528)	(40,669)
Total Assets	$ 298,963		$ 298,963		$ 308,897