Condensed Consolidating Information (Details 3) (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 Consolidating Financial Statements
Net cash provided by (used in) operating activities	$ 117,366	$ 222,463	$ 239,386	$ 392,397
Net cash used in investing activities	(47,689)	(37,179)	(94,235)	(89,849)
Net cash provided by (used in) financing activities	(203,495)	(6,281)	(248,792)	(32,367)
Increase (decrease) in cash and equivalents	(133,818)	179,003	(103,641)	270,181
Cash and equivalents at beginning of period	420,938	277,691	390,761	186,513
Cash and equivalents at end of period	287,120	456,694	287,120	456,694
Parent
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			145,121	314,438
Net cash used in investing activities			(19,249)	(77,125)
Net cash provided by (used in) financing activities			(183,982)	(22,680)
Increase (decrease) in cash and equivalents			(58,110)	214,633
Cash and equivalents at beginning of period			301,073	173,563
Cash and equivalents at end of period	242,963	388,196	242,963	388,196
Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			128,705	112,213
Net cash used in investing activities			(74,342)	(40,015)
Net cash provided by (used in) financing activities			(86,072)	(23,309)
Increase (decrease) in cash and equivalents			(31,709)	48,889
Cash and equivalents at beginning of period			58,699	10,628
Cash and equivalents at end of period	26,990	59,517	26,990	59,517
Combined Non-Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			(39,928)	(34,211)
Net cash used in investing activities			(81,123)	(27,597)
Net cash provided by (used in) financing activities			107,229	68,467
Increase (decrease) in cash and equivalents			(13,822)	6,659
Cash and equivalents at beginning of period			30,989	2,322
Cash and equivalents at end of period	17,167	8,981	17,167	8,981
Consolidating Adjustments
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			5,488	(43)
Net cash used in investing activities			80,479	54,888
Net cash provided by (used in) financing activities			$ (85,967)	$ (54,845)