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Fair Value of Assets and Liabilities (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair value of financial instruments
Concentration risk, percentage	3.00%
GOV
Fair value of financial instruments
Quoted market price (in dollars per share)	$ 24.11	$ 22.55
Carrying Amount
Fair value of financial instruments
Senior notes and mortgage notes payable	$ 2,747,234	$ 2,745,331
Carrying Amount \| GOV
Fair value of financial instruments
Equity investments	170,920	172,186
Total Fair value
Fair value of financial instruments
Senior notes and mortgage notes payable	2,892,845	2,924,141
Total Fair value \| GOV
Fair value of financial instruments
Equity investments	$ 239,895	$ 224,373

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the equity method of accounting as of the balance sheet date.

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