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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends declared and paid per common stock (in dollars per share) | $ 1.86 | $ 1.78 | $ 1.71
Stock issued during period, shares (in shares) | 35,456 | 31,807 | 34,230
Discounted stock purchase program, shares issued (in shares) | 13,695 | 8,444 | 12,065
ATM equity program, shares issued (in shares) | 5,821,366 | 5,716,222 | 8,573,533
Restricted common stock, shares issued (in shares) | 274,102 | 222,157 | 209,284
Series D Depositary Share |  |  |
Preferred stock (in USD per share) | $ 0.312847 | $ 1.65625 | $ 1.65625
Stock issued during period, shares (in shares) | 11,500,000 |  |
Series E Depositary Share |  |  |
Preferred stock (in USD per share) | $ 1.42500 | 1.42500 | $ 1.42500
Series F Preferred Stock |  |  |
Preferred stock (in USD per share) | $ 1.30000 | $ 0.231111 |
Stock issued during period, shares (in shares) |  | 13,800,000 |

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