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Stockholders' Equity (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 01, 2012 Maximum [Member] | Mar. 31, 2012 Series F Preferred Stock [Member] | Mar. 31, 2012 Series F Cumulative Preferred Stock [Member] | Mar. 31, 2012 Convertible Common Stock [Member] | Mar. 31, 2012 Restricted Unit Awards [Member] Y | Mar. 31, 2011 Restricted Unit Awards [Member] | Mar. 31, 2012 ATM [Member] | Mar. 31, 2012 ATM [Member] Common Stock [Member] | Mar. 01, 2012 ATM [Member] Common Stock [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Shares of Company Stock Issuable under an At-the-Market Offering |  | 12,500,000 |  |  |  |  |  |  |  |
Aggregate gross sale proceeds |  |  |  |  |  |  |  |  |  | $ 125,000
Issuance of company common stock |  |  |  |  |  |  |  | 1,532,598 |  |
Weighted average price of common stock |  |  |  |  |  |  |  | $ 12.03 |  |
Proceeds from Common Stock Issuance ATM or DRIP |  |  |  |  |  |  |  | 18,063 |  |
Sale agent commission |  |  |  |  |  |  |  |  | 369 |
Converted Shares of common stock |  |  |  |  | 11,159 |  |  |  |  |
Operating Partnership Units resulted in reclassification |  |  |  |  | 99 |  |  |  |  |
Restricted common stock/unit awards to employees |  |  |  |  |  | 365,137 | 292,339 |  |  |
Fair value of restricted common stock |  |  |  |  |  | 4,327 | 3,248 |  |  |
Vesting period of stock awards granted to employees, maximum |  |  |  |  |  | P3Y |  |  |  |
Recognized compensation related to restricted stock awards |  |  |  |  |  | 1,099 | 645 |  |  |
Unrecognized compensation related to unvested restricted stock awards |  |  |  |  |  | $ 8,307 |  |  |  |
Weighted average period during which unrecognized compensation is expected to be recognized |  |  |  |  |  | 1.05 |  |  |  |
Minimum fixed coupon rate of preferred stock |  |  |  | 2.375% |  |  |  |  |  |
Number of years of U.S treasury rate one |  |  | 30 years |  |  |  |  |  |  |
Number of years of U.S treasury rate two |  |  | 10 years |  |  |  |  |  |  |
New coupon rate of preferred stock |  |  | 5.415% | 5.415% |  |  |  |  |  |
LIBOR rate |  |  | 3 month LIBOR |  |  |  |  |  |  |

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