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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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Total exercise price attributable to options forfeited in the period based upon the number of options forfeited and their weighted average exercise price.

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Total exercise price attributable to options granted in the period based upon the number of options granted and their weighted average exercise price.

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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

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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