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Stockholders' Equity (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Series F Preferred Stock [Member] | Jun. 30, 2012 Series F Cumulative Preferred Stock [Member] | Jun. 30, 2012 Convertible Common Stock [Member] | Jun. 30, 2012 Restricted Stock Unit Awards [Member] | Jun. 30, 2011 Restricted Stock Unit Awards [Member] | Jun. 30, 2012 Restricted Stock Unit Awards [Member] | Jun. 30, 2011 Restricted Stock Unit Awards [Member] | Jun. 30, 2012 ATM [Member] | Mar. 01, 2012 ATM [Member] Maximum [Member] | Jun. 30, 2012 ATM [Member] Common Stock [Member] | Mar. 01, 2012 ATM [Member] Common Stock [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issuable under the At-the-Market offering |  |  |  |  |  |  |  |  |  |  | 12,500,000 |  |
Aggregate gross sale proceeds of common stock under the At-the Market offering |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000
Issuance of common stock under the At-the-Market offering |  |  |  |  |  |  |  |  |  | 1,532,598 |  |  |
Weighted average price of common stock issued under the At-the-Market offering |  |  |  |  |  |  |  |  |  | $ 12.03 |  |  |
Net proceeds from issuance of common stock under the At-the-Market offering |  |  |  |  |  |  |  |  |  | 18,063 |  |  |
Sales agent commission |  |  |  |  |  |  |  |  |  |  |  | 369 |
Converted Shares of common stock |  |  |  |  | 280,991 |  |  |  |  |  |  |  |
Conversion of Units to Common Stock |  |  |  |  | 2,469 |  |  |  |  |  |  |  |
Restricted stock/unit awards to employees |  |  |  |  |  |  |  | 365,137 | 292,339 |  |  |  |
Fair value of restricted stock/unit awards |  |  |  |  |  |  |  | 4,327 | 3,248 |  |  |  |
Vesting period of restricted stock/unit awards to employees |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Recognized compensation expense related to restricted stock/unit awards |  |  |  |  |  | 1,299 | 1,081 | 2,398 | 1,726 |  |  |  |
Unrecognized compensation expense related to restricted stock/unit awards |  |  |  |  |  | $ 6,890 |  | $ 6,890 |  |  |  |  |
Weighted average period during which unrecognized compensation expense is expected to be recognized |  |  |  |  |  |  |  | 11 months 19 days |  |  |  |  |
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 |  |  | 5.705% | 5.705% |  |  |  |  |  |  |  |  |
LIBOR rate |  |  | 3 month LIBOR |  |  |  |  |  |  |  |  |  |

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