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Stockholders' Equity (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 1 Months Ended |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | May 31, 2011 | Mar. 03, 2011 | Oct. 05, 2009 | Feb. 28, 2011 Maximum [Member] | May 04, 2010 Maximum [Member] | Dec. 31, 2011 Series F Preferred Stock [Member] | Dec. 31, 2011 Series F Preferred Stock [Member] | Dec. 31, 2010 Series F Preferred Stock [Member] | May 27, 2004 Series F Preferred Stock [Member] | Dec. 31, 2011 Series F Cumulative Preferred Stock [Member] | Dec. 31, 2011 Series G Cumulative Preferred Stock [Member] | Dec. 31, 2011 Series G Preferred Stock [Member] | Dec. 31, 2011 Series G Preferred Stock [Member] | Dec. 31, 2010 Series G Preferred Stock [Member] | May 27, 2004 Series G Preferred Stock [Member] | Dec. 31, 2011 Series J Preferred Stock [Member] | Dec. 31, 2010 Series J Preferred Stock [Member] | Jan. 13, 2006 Series J Preferred Stock [Member] | Dec. 31, 2011 Series K Preferred Stock [Member] | Dec. 31, 2010 Series K Preferred Stock [Member] | Aug. 21, 2006 Series K Preferred Stock [Member] | Jun. 30, 2011 Common Stock [Member] | Mar. 31, 2011 Common Stock [Member] | Oct. 31, 2009 Common Stock [Member] | Jun. 06, 2011 Common Stock [Member] | May 31, 2011 Common Stock [Member] | Mar. 04, 2011 Common Stock [Member] | Mar. 03, 2011 Common Stock [Member] | Oct. 05, 2009 Common Stock [Member] | Dec. 31, 2011 Convertible Common Stock [Member] | Dec. 31, 2010 Convertible Common Stock [Member] | Dec. 31, 2009 Convertible Common Stock [Member] | Dec. 31, 2011 ATM [Member] | Dec. 31, 2010 ATM [Member] | Dec. 31, 2011 ATM [Member] Common Stock [Member] | Dec. 31, 2010 ATM [Member] Common Stock [Member] | Feb. 28, 2011 ATM [Member] Common Stock [Member] | Dec. 31, 2010 DRIP [Member] | Dec. 31, 2009 DRIP [Member] | Dec. 31, 2011 DRIP [Member] | Dec. 31, 2010 DRIP [Member] Common Stock [Member] | Dec. 31, 2009 DRIP [Member] Common Stock [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue date of depositary shares |  |  |  |  |  |  |  |  |  |  |  | May 27, 2004 |  |  |  |  |  | May 27, 2004 |  |  | Jan. 13, 2006 |  |  | Aug. 21, 2006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares issued |  |  |  |  |  |  |  |  | 500 | 500 | 500 | 50,000 |  |  | 250 | 250 | 250 | 25,000 | 600 | 600 | 6,000,000 | 200 | 200 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Part of each shares issued |  |  |  |  |  |  |  |  |  |  |  | 0.01 |  |  |  |  |  | 0.01 |  |  | 0.0001 |  |  | 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value of each depository shares | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial offering price per depository share |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 |  |  |  |  |  | $ 1,000.00 |  |  | $ 25.00 |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend exception rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum fixed coupon rate of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | 2.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent to per depositary share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share percentage of per depositary share |  |  |  |  |  |  |  |  |  | 6.236% |  |  |  | 7.236% |  | 7.236% |  |  | 7.25% |  |  | 7.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rates during floating rate periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years of U.S treasury rate one |  |  |  |  |  |  |  |  | 30 years | 30 years |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years of U.S treasury rate two |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate |  |  |  |  |  |  |  |  | 3-month LIBOR Rate | 3-month LIBOR Rate |  |  |  |  | 3-month LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New coupon rate of preferred stock |  |  |  |  |  |  |  |  | 5.365% | 5.365% |  |  | 5.365% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,784 | 27,586 | 415,466 |  |  |  |  |  |  |  |  |  |
Operating Partnership Units resulted in reclassification | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,109 | $ 316 | $ 7,817 |  |  |  |  |  |  |  |  |  |
Underwritten public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,400,000 |  | 8,900,000 | 13,635,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross offering proceeds upon settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,060 |  | 101,460 |  | 71,587 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs related to underwriter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,176 | 890 | 3,042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total expenses related to underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138 | 166 | 765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,746 | 100,404 | 67,780 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of Company Stock Issuable under an At-the-Market Offering |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross sale proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Issuance of company common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115,856 | 5,469,767 |  |  |  | 875,402 | 3,034,120 | 0 |  |
Proceeds from Common Stock Issuance ATM or DRIP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,391 | 44,117 |  |  |  | 5,970 | 15,920 |  |  |
Sale agent commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 | 900 |  |  |  |  |  |
Shares awarded to directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,567 | 50,445
Common stock approx fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 128 | $ 240 |  |  |
Stockholders' Equity (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Previous common stock authorized for issuance |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock authorized for issuance | 150,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock price per share |  |  |  | $ 12.15 | $ 11.40 | $ 5.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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