Noncontrolling Interests (Redeemable Preferred Units) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Activity of Noncontrolling Interests [Roll Forward]
Beginning Balance			$ 633
Net Income	$ 3	$ 320	6	$ 939
Redemption of redeemable preferred units (Series Four Preferred Units)			633	0
Ending Balance	0		0
Redeemable Preferred Units [Member]
Activity of Noncontrolling Interests [Roll Forward]
Beginning Balance			633	51,312
Net Income			6	939
Distributions			(6)	(939)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units				(33,306)
Redemption of redeemable preferred units (Series Four Preferred Units)			(633)
Ending Balance	$ 0	$ 18,006	$ 0	$ 18,006