Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) (Parent Company [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (71,429)
Other Comprehensive Income (Loss), Net of Tax	2,349	2,366	7,031	7,099
Accumulated Other Comprehensive Income (Loss), Net of Tax	(64,378)		(64,378)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			9
Other Comprehensive Income (Loss), Net of Tax			(34)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(25)		(25)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax			7,051	7,085
Loss on Settlement of Derivative Instruments [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(71,438)
Other Comprehensive Income (Loss), Net of Tax			7,085
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (64,353)		$ (64,353)