Noncontrolling Interests (Noncontrolling Interests-Property Partnerships) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Activity of noncontrolling interests
Beginning balance			$ (1,964)
Noncontrolling interest recorded upon consolidation			480,861	0
Capital contributions			6,386	0
Net Income (loss)	(3,279)	458	(924)	1,461
Ending balance	481,629		481,629
Property Partnerships [Member]
Activity of noncontrolling interests
Beginning balance			(1,964)	(1,063)
Noncontrolling interest recorded upon consolidation			480,861
Capital contributions			10,932
Net Income (loss)			(5,950)	1,461
Distributions			(2,250)	(2,250)
Ending balance	$ 481,629	$ (1,852)	$ 481,629	$ (1,852)