Reportable Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reconciliation of reportable segment operating income to consolidated income before income taxes
Operating income	$ 12,452	$ 11,394	$ 23,581	$ 36,325
Interest expense	25,138	24,185	50,146	49,083
Earnings from equity investments	3,495	6,915	9,631	15,760
Other income (expense), net	193	(1,208)	(805)	(686)
Net (loss) income from continuing operations before income taxes	(8,998)	(7,084)	(17,739)	2,316
Reported Segment
Reconciliation of reportable segment operating income to consolidated income before income taxes
Operating income	35,311	32,795	69,643	79,871
Unallocated corporate costs
Reconciliation of reportable segment operating income to consolidated income before income taxes
Operating income	35,311	32,795	69,643	79,871
Unallocated corporate costs	$ (22,859)	$ (21,401)	$ (46,062)	$ (43,546)