Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Feb. 18, 2014	Aug. 29, 2013 D
Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Series Two Preferred Units (in shares)	666,116
Series Two Preferred Units On Converted Basis	874,168
Series Four Preferred Units (in shares)	360,126
Series Two Preferred Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred Units Liquidation Preference	$ 50.00
OP Units for each Preferred Unit (in shares)	1.312336
Series Two Preferred Units [Member] | Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Series Two Preferred Units (in shares)	666,116
Liquidation preference percentage	6.00%
Preferred Units Liquidation Preference	$ 50.00
Operating Units liquidation preference (in dollars per share)	$ 38.10
OP Units for each Preferred Unit (in shares)	1.312336
Series Two Preferred Units On Converted Basis	874,168
Distributions to Series Two Preferred Units (in dollars per share)		$ 0.85302
series four preferred units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred Units Liquidation Preference	$ 50.00
Series Four Preferred Units Annual Dividend Payable Rate	2.00%
series four preferred units [Member] | Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred Units Liquidation Preference	$ 50.00
First opportunity to redeem Series Four Preferred Units (in days)			30
Distributions to Series Two Preferred Units (in dollars per share)		$ 0.25
Series Four Preferred Units (in shares)	360,126
Series Four Preferred Units Annual Dividend Payable Rate	2.00%