Condensed Consolidating Information (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	$ 312,175	$ 445,694	$ 486,355
Net cash used in investing activities	(152,845)	(191,601)	(235,837)
Net cash provided by (used in) financing activities	(140,091)	(268,937)	(46,270)
Increase (decrease) in cash and equivalents	19,239	(14,844)	204,248
Cash and equivalents at beginning of year	375,917	390,761	186,513
Cash and equivalents at end of year	395,156	375,917	390,761
Reportable legal entity | Parent
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	190,616	306,613	380,171
Net cash used in investing activities	(170,561)	(104,242)	(230,314)
Net cash provided by (used in) financing activities	(21,896)	(180,737)	(22,347)
Increase (decrease) in cash and equivalents	(1,841)	21,634	127,510
Cash and equivalents at beginning of year	322,707	301,073	173,563
Cash and equivalents at end of year	320,866	322,707	301,073
Reportable legal entity | Guarantors
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	190,885	209,579	173,574
Net cash used in investing activities	(41,415)	(107,274)	(50,576)
Net cash provided by (used in) financing activities	(129,997)	(119,329)	(74,927)
Increase (decrease) in cash and equivalents	19,473	(17,024)	48,071
Cash and equivalents at beginning of year	41,675	58,699	10,628
Cash and equivalents at end of year	61,148	41,675	58,699
Reportable legal entity | Combined Non-Guarantors
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	(80,525)	(76,363)	(68,110)
Net cash used in investing activities	(23,086)	(95,314)	(65,144)
Net cash provided by (used in) financing activities	105,218	152,223	161,921
Increase (decrease) in cash and equivalents	1,607	(19,454)	28,667
Cash and equivalents at beginning of year	11,535	30,989	2,322
Cash and equivalents at end of year	13,142	11,535	30,989
Consolidating Adjustments
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	11,199	5,865	720
Net cash used in investing activities	82,217	115,229	110,197
Net cash provided by (used in) financing activities	$ (93,416)	$ (121,094)	$ (110,917)