Financial Information Related To Guarantor Subsidiaries (Statement Of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 365,935	$ 142,554	$ 81,817
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(897)
Change in cumulative translation adjustment	8,516	(1,236)	(6,704)
Comprehensive income	373,554	141,318	75,113
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	365,935	142,554	81,817
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(897)
Change in cumulative translation adjustment	8,516	(1,236)	(6,704)
Comprehensive income	373,554	141,318	75,113
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	566,020	218,198	119,801
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(897)
Change in cumulative translation adjustment	8,516	(1,236)	(6,704)
Comprehensive income	573,639	216,962	113,097
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	811,766	361,541	260,076
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Change in cumulative translation adjustment	1,042
Comprehensive income	812,808	361,541	260,076
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	46,884	(28,367)	(1,264)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Change in cumulative translation adjustment	8,516	(1,236)	(6,704)
Comprehensive income	55,400	(29,603)	(7,968)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(1,424,670)	(551,372)	(378,613)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	897
Change in cumulative translation adjustment	(18,074)	2,472	13,408
Comprehensive income	$ (1,441,847)	$ (548,900)	$ (365,205)