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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock - cash dividends declared per share (in dollars per share) | $ 0.36 | $ 0.28 |  | $ 0.24 |
Preferred stock - cash dividends declared per share (in dollars per share) | $ 6,200 | $ 6,200 |  | $ 6,200 |
Common stock repurchased under share repurchase program | $ 5,554 | $ 97,396 | [1] | $ 32,648 | [1]
Stock Repurchase Authorization |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchased under share repurchase program |  | $ 93,500 |  | $ 28,400 |
[1] | 2016 and 2015 include $93.5 million and $28.4 million, respectfully, repurchased under share repurchase programs.

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