Financial Information Related to Guarantor Subsidiaries (Statement of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 93,887	$ 59,580	$ 289,660	$ 123,192
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	2,198		(642)
Change in cumulative translation adjustment	7,216	(6,027)	7,146	2,539
Comprehensive income	103,301	53,553	296,164	125,731
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	93,886	59,580	289,660	123,192
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	2,198		(642)
Change in cumulative translation adjustment	7,216	(6,027)	7,146	2,539
Comprehensive income	103,300	53,553	296,164	125,731
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	146,257	94,682	452,358	190,643
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	2,198		(642)
Change in cumulative translation adjustment	7,216	(6,027)	7,146	2,539
Comprehensive income	155,671	88,655	458,862	193,182
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	208,894	127,403	655,466	301,149
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Change in cumulative translation adjustment	1,529		1,073
Comprehensive income	210,423	127,403	656,539	301,149
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	7,747	(7,754)	26,213	(32,005)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Change in cumulative translation adjustment	7,216	(6,027)	7,146	2,539
Comprehensive income	14,963	(13,781)	33,359	(29,466)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(362,897)	(214,331)	(1,134,037)	(459,787)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(2,198)		642
Change in cumulative translation adjustment	(15,961)	12,054	(15,365)	(5,078)
Comprehensive income	$ (381,056)	$ (202,277)	$ (1,148,760)	$ (464,865)