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Retirement and Share-based Compensation Plans (Changes in the Number of Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Outstanding, number of shares | 2,918,946 | 3,443,991 | 4,044,175 | 3,976,725
Outstanding, weighted-average exercise price per share | $ 16.06 | $ 15.17 | $ 15.02 | $ 10.86
Outstanding, total exercise price | $ 46,885 | $ 52,240 | $ 60,760 | $ 43,171
Granted, number of shares | 0 | 0 | 1,277,650 |
Granted, weighted-average exercise price per share | $ 0.00 | $ 0.00 | $ 24.79 |
Granted, total exercise price | $ 0 | $ 0 | $ 31,673 |
Canceled, number of shares | (24,700) | (47,300) | (35,400) |
Canceled, weighted-average exercise price per share | $ 14.83 | $ 10.54 | $ 11.64 |
Canceled, total exercise price | $ (366) | $ (499) | $ (412) |
Exercised, number of shares | (500,345) | (552,884) | (1,174,800) |
Exercised, weighted-average exercise price per share | $ 9.97 | $ 14.51 | $ 11.64 |
Exercised, total exercise price | $ (4,989) | $ (8,021) | $ (13,672) |

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- Definition Total exercise price attributable to options granted in the period based upon the number of options granted and their weighted average exercise price. + References No definition available. + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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