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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 |
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Outstanding, number of shares | 3,443,991 | 4,044,175 | 3,976,725 | 5,732,450
Outstanding, weighted-average exercise price per share | $ 15.17 | $ 15.02 | $ 10.86 | $ 10.35
Outstanding, total exercise price | $ 52,240 | $ 60,760 | $ 43,171 | $ 59,321
Granted, number of shares | 0 | 1,277,650 | 1,210,950 |
Granted, weighted-average exercise price per share | $ 0.00 | $ 24.79 | $ 13.13 |
Granted, total exercise price | $ 0 | $ 31,673 | $ 15,899 |
Canceled, number of shares | (47,300) | (35,400) | (29,400) |
Canceled, weighted-average exercise price per share | $ 10.54 | $ 11.64 | $ 9.96 |
Canceled, total exercise price | $ (499) | $ (412) | $ (293) |
Exercised, number of shares | (552,884) | (1,174,800) | (2,937,275) |
Exercised, weighted-average exercise price per share | $ 14.51 | $ 11.64 | $ 10.81 |
Exercised, total exercise price | $ (8,021) | $ (13,672) | $ (31,756) |

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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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