Condensed Consolidating Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities	$ 309,212	$ 76,014	$ 543,919	$ 48,767
Net cash used in investing activities	(22,015)	(31,220)	(53,703)	(27,177)
Net cash provided by (used in) financing activities	(28,778)	(30,223)	(432,178)	(59,256)
Increase (decrease) in cash and equivalents	258,419	14,571	58,038	(37,666)
Cash and equivalents at beginning of period	160,982	342,919	361,363	395,156
Cash and equivalents at end of period	419,401	357,490	419,401	357,490
Reportable legal entity | Parent
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			212,624	94,219
Net cash used in investing activities			(31,419)	(34,747)
Net cash provided by (used in) financing activities			(94,522)	(83,113)
Increase (decrease) in cash and equivalents			86,683	(23,641)
Cash and equivalents at beginning of period			265,313	320,866
Cash and equivalents at end of period	351,996	297,225	351,996	297,225
Reportable legal entity | Guarantors
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			322,486	(19,938)
Net cash used in investing activities			(18,495)	(10,007)
Net cash provided by (used in) financing activities			(330,095)	19,258
Increase (decrease) in cash and equivalents			(26,104)	(10,687)
Cash and equivalents at beginning of period			81,690	61,148
Cash and equivalents at end of period	55,586	50,461	55,586	50,461
Reportable legal entity | Combined Non-Guarantors
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			246	(23,559)
Net cash used in investing activities			(13,260)	(13,076)
Net cash provided by (used in) financing activities			10,473	33,297
Increase (decrease) in cash and equivalents			(2,541)	(3,338)
Cash and equivalents at beginning of period			14,360	13,142
Cash and equivalents at end of period	$ 11,819	$ 9,804	11,819	9,804
Consolidating Adjustments
Condensed Consolidating Statements of Cash Flows
Net cash provided by (used in) operating activities			8,563	(1,955)
Net cash used in investing activities			9,471	30,653
Net cash provided by (used in) financing activities			$ (18,034)	$ (28,698)