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Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Aug. 04, 2016 | Feb. 29, 2016
Equity [Abstract] |  |  |  |
Repurchase of common stock, authorized amount |  |  | $ 50,000,000.0 | $ 50,000,000.0
Stock repurchased and retired during period, shares | 10.2 | 5.7 |  |
Common stock value acquired including acquisition costs | $ 98,400,000 | $ 70,400,000 |  |
Average cost per share | $ 9.67 | $ 12.25 |  |
Available repurchase of common stock, authorized amount | $ 50,000,000 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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