Condensed Consolidating Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	$ 76,014	$ 32,715	$ 48,767	$ 62,425
Net cash used in investing activities	(31,220)	(48,373)	(27,177)	(59,785)
Net cash provided by (used in) financing activities	(30,223)	(218,450)	(59,256)	(134,804)
Increase (decrease) in cash and equivalents	14,571	(234,108)	(37,666)	(132,164)
Cash and equivalents at beginning of period	342,919	477,861	395,156	375,917
Cash and equivalents at end of period	357,490	243,753	357,490	243,753
Reportable Legal Entities [Member] | Parent Company [Member]
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			94,219	(6,011)
Net cash used in investing activities			(34,747)	(62,083)
Net cash provided by (used in) financing activities			(83,113)	(40,896)
Increase (decrease) in cash and equivalents			(23,641)	(108,990)
Cash and equivalents at beginning of period			320,866	322,707
Cash and equivalents at end of period	297,225	213,717	297,225	213,717
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			(19,938)	98,049
Net cash used in investing activities			(10,007)	(24,118)
Net cash provided by (used in) financing activities			19,258	(100,880)
Increase (decrease) in cash and equivalents			(10,687)	(26,949)
Cash and equivalents at beginning of period			61,148	41,675
Cash and equivalents at end of period	50,461	14,726	50,461	14,726
Reportable Legal Entities [Member] | Non Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			(23,559)	(39,730)
Net cash used in investing activities			(13,076)	(9,484)
Net cash provided by (used in) financing activities			33,297	52,989
Increase (decrease) in cash and equivalents			(3,338)	3,775
Cash and equivalents at beginning of period			13,142	11,535
Cash and equivalents at end of period	9,804	15,310	9,804	15,310
Consolidation Eliminations [Member]
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			(1,955)	10,117
Net cash used in investing activities			30,653	35,900
Net cash provided by (used in) financing activities			$ (28,698)	$ (46,017)