Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified		0 Months Ended	4 Months Ended		9 Months Ended
	Sep. 30, 2014 Noncontrolling Interests [Member]	Mar. 11, 2014 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	May 12, 2014 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Feb. 18, 2014 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Sep. 30, 2014 Series Four Preferred Units [Member]	Sep. 30, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Aug. 15, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Jul. 03, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	May 19, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	May 15, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Feb. 18, 2014 Series Four 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		$ 50.00	$ 50.00
Series Four Preferred Units Released from Escrow									319,687
Redemption of Series Four Preferred Units								$ 16.0
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	874,168
Distributions to Series Two Preferred Units (in dollars per share)				$ 0.85302			$ 0.25			$ 0.25	$ 0.25
Series Four Preferred Units (in shares)	40,440					40,440		40,440
Series Four Preferred Units Annual Dividend Payable Rate					2.00%	2.00%