Condensed Consolidating Information (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	$ 445,694	$ 486,355	$ 169,307
Net cash used in investing activities	(191,601)	(235,837)	(149,078)
Financing activities
Issuance of long term debt	1,049,969	10,103	556,553
Repayments of long term debt	(1,258,842)	(7,740)	(346,963)
Other	(60,064)	(48,633)	(52,314)
Net cash provided by (used in) financing activities	(268,937)	(46,270)	157,276
Increase (decrease) in cash and equivalents	(14,844)	204,248	177,505
Cash and equivalents at beginning of year	390,761	186,513	9,008
Cash and equivalents at end of year	375,917	390,761	186,513
Parent
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	306,613	380,171	262,155
Net cash used in investing activities	(104,242)	(230,314)	(38,811)
Financing activities
Issuance of long term debt	1,025,257		554,001
Repayments of long term debt	(1,213,022)	(6,505)	(361,383)
Other	7,028	(15,842)	(242,829)
Net cash provided by (used in) financing activities	(180,737)	(22,347)	(50,211)
Increase (decrease) in cash and equivalents	21,634	127,510	173,133
Cash and equivalents at beginning of year	301,073	173,563	430
Cash and equivalents at end of year	322,707	301,073	173,563
Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	209,579	173,574	17,011
Net cash used in investing activities	(107,274)	(50,576)	(51,414)
Financing activities
Issuance of long term debt		10,103
Repayments of long term debt	(29,901)	(1,075)	14,979
Other	(89,428)	(83,955)	23,690
Net cash provided by (used in) financing activities	(119,329)	(74,927)	38,669
Increase (decrease) in cash and equivalents	(17,024)	48,071	4,266
Cash and equivalents at beginning of year	58,699	10,628	6,362
Cash and equivalents at end of year	41,675	58,699	10,628
Combined Non-Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	(76,363)	(68,110)	(109,221)
Net cash used in investing activities	(95,314)	(65,144)	(59,491)
Financing activities
Issuance of long term debt	111,085	101,686	110,743
Repayments of long term debt	(115,162)	(82,241)	(559)
Other	156,300	142,476	58,634
Net cash provided by (used in) financing activities	152,223	161,921	168,818
Increase (decrease) in cash and equivalents	(19,454)	28,667	106
Cash and equivalents at beginning of year	30,989	2,322	2,216
Cash and equivalents at end of year	11,535	30,989	2,322
Consolidating Adjustments
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	5,865	720	(638)
Net cash used in investing activities	115,229	110,197	638
Financing activities
Issuance of long term debt	(86,373)	(101,686)	(108,191)
Repayments of long term debt	99,243	82,081
Other	(133,964)	(91,312)	108,191
Net cash provided by (used in) financing activities	$ (121,094)	$ (110,917)