Shareholders' Equity (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total redemption value of preference shares		$ 2,096,000	$ 58,304,000
Face value of shares repurchased		2,096,000
Adjustment of Ratable portion of issuance costs	4,492,000	163,000	4,492,000
Issuance of shares in conjunction with acquisition		2,100,000
Fair value of issued shares in conjunction with acquisition		28,400,000
Premier Portfolio [Member]
Issuance of shares in conjunction with acquisition		2,100,000
Fair value of issued shares in conjunction with acquisition		28,400,000
8.375% Series O Cumulative Redeemable Preferred Shares [Member]
Number of shares repurchased		80,000
Preferred stock dividend rate, percentage		8.375%
Total redemption value of preference shares		2,100,000
Face value of shares repurchased		2,000,000
Adjustment of Ratable portion of issuance costs		$ 163,000

The number of limited partner units issued.

The cash outflow for reacquisition of callable preferred stock.

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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