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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Common stock (in dollars per share) | $ 1.78 | $ 1.71 | $ 1.65
Stock issued during period, shares | 31,807 | 34,230 | 5,493,595
ATM equity program, shares | 5,716,222 | 8,573,533 | 3,758,362
Discounted stock purchase program, shares | 8,444 | 12,065 | 100,161
Restricted common stock, shares | 222,157 | 209,284 | 360,808
Series D Depositary Share |  |  |
Series D preferred stock (in USD per share) | $ 1.65625 | $ 1.65625 | $ 1.65625
Depositary shares issued (in shares) | 115,000 | 115,000 |
Series E Depositary Share |  |  |
Series D preferred stock (in USD per share) | $ 1.42500 | $ 1.42500 | $ 1.42500
Depositary shares issued (in shares) | 115,000 | 115,000 |
Series F Preferred Stock |  |  |
Series D preferred stock (in USD per share) | $ 0.231111 | $ 0.231111 |
Depositary shares issued (in shares) | 138,000 | 0 |

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