Condensed Consolidating Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	$ 183,266	$ 117,366	$ 245,691	$ 239,386
Net cash provided by (used in) investing activities	(51,318)	(47,689)	(111,103)	(94,235)
Net cash provided by (used in) financing activities	(5,645)	(203,495)	(140,449)	(248,792)
Increase (decrease) in cash and equivalents	126,303	(133,818)	(5,861)	(103,641)
Cash and equivalents at beginning of period	243,753	420,938	375,917	390,761
Cash and equivalents at end of period	370,056	287,120	370,056	287,120
Parent
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			126,404	145,121
Net cash provided by (used in) investing activities			(115,979)	(19,249)
Net cash provided by (used in) financing activities			(10,920)	(183,982)
Increase (decrease) in cash and equivalents			(495)	(58,110)
Cash and equivalents at beginning of period			322,707	301,073
Cash and equivalents at end of period	322,212	242,963	322,212	242,963
Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			164,383	128,705
Net cash provided by (used in) investing activities			(28,654)	(74,342)
Net cash provided by (used in) financing activities			(139,694)	(86,072)
Increase (decrease) in cash and equivalents			(3,965)	(31,709)
Cash and equivalents at beginning of period			41,675	58,699
Cash and equivalents at end of period	37,710	26,990	37,710	26,990
Combined Non-Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			(56,636)	(39,928)
Net cash provided by (used in) investing activities			(20,230)	(81,123)
Net cash provided by (used in) financing activities			75,465	107,229
Increase (decrease) in cash and equivalents			(1,401)	(13,822)
Cash and equivalents at beginning of period			11,535	30,989
Cash and equivalents at end of period	10,134	17,167	10,134	17,167
Consolidating Adjustments
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			11,540	5,488
Net cash provided by (used in) investing activities			53,760	80,479
Net cash provided by (used in) financing activities			$ (65,300)	$ (85,967)