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Consolidated Statements of Equity (Parenthetical)	12 Months Ended
Consolidated Statements of Equity (Parenthetical)	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2014
Operating Partnership common units converted to shares of common stock (in shares)	12,466,000
Series E Preferred Stock [Member]
Issuance of shares of stock (in shares)		6,900,000
Preferred Stock [Member] \| Series E Preferred Stock [Member]
Issuance of shares of stock (in shares)	690,000
Common Stock [Member]
Operating Partnership common units converted to shares of common stock (in shares)	12,466,000
Shares of common stock issued under deferred compensation arrangement (in shares)	42,484
Common Stock [Member] \| Common Stock and Restricted Common Stock [Member]
Issuance of shares of stock (in shares)	232,560	8,772,114	246,168
Common Stock [Member] \| Restricted Common Stock [Member]
Shares of restricted common stock canceled (in shares)	39,779	41,661	34,039

- Definition

The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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