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Retirement and Share-based Compensation Plans (Changes in Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Outstanding, number of shares | 1,980,265 | 2,918,946 | 3,443,991 | 4,044,175
Outstanding, weighted-average exercise price per share | $ 16.20 | $ 16.06 | $ 15.17 | $ 15.02
Outstanding, total exercise price | $ 32,084 | $ 46,885 | $ 52,240 | $ 60,760
Granted, number of shares | 0 | 0 | 0 |
Granted, weighted-average exercise price per share | $ 0.00 | $ 0.00 | $ 0.00 |
Granted, total exercise price | $ 0 | $ 0 | $ 0 |
Canceled, number of shares | (57,200) | (24,700) | (47,300) |
Canceled, weighted-average exercise price per share | $ 13.66 | $ 14.83 | $ 10.54 |
Canceled, total exercise price | $ (781) | $ (366) | $ (499) |
Exercised, number of shares | (881,481) | (500,345) | (552,884) |
Exercised, weighted-average exercise price per share | $ 15.90 | $ 9.97 | $ 14.51 |
Exercised, total exercise price | $ (14,020) | $ (4,989) | $ (8,021) |

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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