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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common stock (in dollars per share) | $ 1.71 | $ 1.65 | $ 1.60
Stock issued during period, shares | 34,230 | 5,493,595 | 29,013
ATM equity program, shares | 8,573,533 | 3,758,362 | 6,956,992
Conversion of 2028 Notes, shares |  |  | 2,407,911
Discounted stock purchase program, shares | 12,065 | 100,161 | 322,084
Restricted common stock, shares | 209,284 | 360,808 | 290,181
Series D Depositary Share |  |  |
Series D preferred stock (in dollars per share) | $ 1.65625 | $ 1.65625 | $ 1.65625
Series E Depositary Share |  |  |
Series D preferred stock (in dollars per share) | $ 1.42500 | $ 1.42500 | $ 0.77188
Stock issued during period, shares |  |  | 11,500,000

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