Noncontrolling Interests Redeemable Noncontrolilng Interests Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests at beginning of year			$ 19,468	$ 19,287
Net income attributable to noncontrolling interests	1,025	969	2,261	1,899
Redeemable noncontrolling interest, decrease from distributions to redeemable noncontrolling interest holders			2,162	1,678
Noncontrolling Interest, adjustment to fair value			1,328	(1,847)
Redeemable noncontrolling interests at end of period	$ 20,895	$ 17,661	$ 20,895	$ 17,661