Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	$ 3,840,185	$ 2,909,319	$ 7,196,699	$ 5,715,970
Operating Income (Loss)	1,092,044	692,339	1,925,118	1,252,111
Other Income (Expense), Net	4,833	4,675	(5,301)	15,306
Interest Expense, Net	61,647	50,775	123,568	101,044
Income Before Income Taxes	1,035,230	646,239	1,796,249	1,166,373
Total Assets	29,077,152		29,077,152		27,336,578
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	3,612,224	2,660,452	6,644,076	5,251,793
Operating Income (Loss)	1,083,643	634,927	1,774,169	1,165,878
Total Assets	26,072,533		26,072,533		24,523,072
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	89,140	96,489	272,883	184,559
Operating Income (Loss)	(20,083)	(14,052)	51,330	(52,636)
Total Assets	976,093		976,093		1,202,031
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	132,924	146,274	268,272	267,344
Operating Income (Loss)	71,893	92,947	152,788	170,160
Total Assets	1,094,649		1,094,649		1,012,727
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	5,897	6,104	11,468	12,274
Operating Income (Loss)	(43,409)	(21,483)	(53,169)	(31,291)
Total Assets	$ 933,877		$ 933,877		$ 598,748