Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	$ 2,909,319	$ 2,570,250	$ 5,715,970	$ 4,467,356
Operating Income (Loss)	692,339	588,253	1,252,111	860,704
Other Income, Net	4,675	6,224	15,306	9,828
Interest Expense, Net	50,775	51,253	101,044	101,586
Income Before Income Taxes	646,239	543,224	1,166,373	768,946
Total Assets	25,998,577		25,998,577		24,838,797
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	2,660,452	2,281,055	5,251,793	3,908,653
Operating Income (Loss)	634,927	804,653	1,165,878	1,014,539
Total Assets	22,736,423		22,736,423		21,313,158
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	96,489	140,575	184,559	256,538
Operating Income (Loss)	(14,052)	(299,980)	(52,636)	(319,416)
Total Assets	1,990,255		1,990,255		2,131,949
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	146,274	141,454	267,344	287,342
Operating Income (Loss)	92,947	91,909	170,160	183,109
Total Assets	921,664		921,664		1,085,664
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	6,104	7,166	12,274	14,823
Operating Income (Loss)	(21,483)	(8,329)	(31,291)	(17,528)
Total Assets	$ 350,235		$ 350,235		$ 308,026