Shareholders' Equity Shareholders' Equity (Stock Repurchased and Retired) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Shareholders' Equity (Stock Repurchased and Retired) [Abstract] | |||
| Stock Repurchased and Retired During Period, Shares | 357 | 948 | 1,011 |
| Treasury Stock Acquired, Average Cost Per Share | $ 46.45 | $ 61.73 | $ 54.87 |
| Stock Repurchased and Retired During Period, Value | $ 16,567 | $ 58,510 | $ 55,467 |
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- Definition Shareholders' Equity (Stock Repurchased and Retired) [Abstract] No definition available.
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- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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