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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Series D Depositary Share | Dec. 31, 2013 Series E Depositary Share
Series C preferred stock, per share |  | $ 0.53776 | $ 1.84375 |  |
Series D preferred stock, per share |  |  |  | $ 1.34340 | $ 0.77188
Common stock, per share | $ 1.60 | $ 1.56 | $ 1.53 |  |
Stock issued during period, shares | 29,013 | 40,460 | 17,288,265 | 11,500,000 | 11,500,000
ATM equity program, shares | 6,956,992 | 4,282,298 |  |  |
Conversion of 2028 Notes, shares | 2,407,911 |  |  |  |
Discounted stock purchase program, shares | 322,084 | 1,689,160 | 3,197,127 |  |
Restricted common stock, shares | 290,181 | 373,913 | 133,432 |  |

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