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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Series D Depositary Share [Member]
Series C preferred stock, per share | $ 0.53776 | $ 1.84375 | $ 1.84375 |
Series D preferred stock, per share |  | $ 1.84375 | $ 1.84375 | $ 1.34340
Common stock, per share | $ 1.56 | $ 1.53 | $ 1.51 |
Stock issued during period, shares | 40,460 | 17,288,265 | 39,872 | 11,500,000
ATM equity program, shares | 4,282,298 |  |  |
Discounted stock purchase program, shares | 1,689,160 | 3,197,127 | 491,705 |
Restricted common stock, shares | 373,913 | 133,432 | 377,164 |

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