|
Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) (USD $)
|
3 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013
Noncontrolling Interests [Member]
|
Mar. 31, 2013
Series Two Preferred Units [Member]
|
Mar. 31, 2013
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
May 14, 2013
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
Feb. 15, 2013
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
Dec. 31, 2012
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
Dec. 31, 2011
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
Dec. 31, 2010
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
Dec. 31, 2009
Series Two Preferred Units [Member]
Noncontrolling Interests [Member]
|
Mar. 31, 2013
series four preferred units [Member]
|
Mar. 31, 2013
series four preferred units [Member]
Noncontrolling Interests [Member]
|
Feb. 15, 2013
series four preferred units [Member]
Noncontrolling Interests [Member]
|
Mar. 31, 2013
Redemption Year Two Thousand Fourteen [Member]
|
|
| Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] | |||||||||||||
| Maximum Redeemable On Redemption Dates Preferred Units | 1,007,662 | ||||||||||||
| Series Two Preferred Units (in shares) | 995,997 | 995,997 | |||||||||||
| Liquidation preference percentage | 6.00% | ||||||||||||
| Preferred Units Liquidation Preference | $ 50.00 | $ 50.00 | $ 50.00 | $ 50.00 | |||||||||
| Operating Units liquidation preference (in dollars per share) | $ 38.10 | ||||||||||||
| OP Units for each Preferred Unit (in shares) | 1.312336 | 1.312336 | |||||||||||
| Series Two Preferred Units Redemption Price | $ 50.00 | ||||||||||||
| Dates Series Two Preferred Unit Holders Can Require Redemption From Operating Partnership | May 12, 2014 | ||||||||||||
| Maximum portion that may be required for redemption of total | 0.1666666667 | ||||||||||||
| Distributions to Series Two Preferred Units (in dollars per share) | $ 0.85302 | $ 0.25 | |||||||||||
| Series Four Preferred Units (in shares) | 1,221,527 | 1,221,527 | |||||||||||
| Series Four Preferred Units Annual Dividend Payable Rate | 2.00% | 2.00% | |||||||||||
| Number Of Holders Exercises | 0 | 0 | 0 | 0 | 0 | ||||||||