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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 01, 2017 shares	May 08, 2017 $ / shares shares	May 31, 2014 shares	Jun. 30, 2014 shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) shares $ / shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation, Aggregate Disclosures:
Maximum number of shares per participant, 12 month period (in shares)			1,000,000.0	2,500,000.0
Extension of plan term				10 years
Share-based compensation costs charged against income | $					$ 2,200	$ 2,400	$ 6,900	$ 6,300
Tax benefit recognized from share-based compensation expense | $					(100)	$ 1,300	1,400	2,500
Unrecognized compensation costs related to nonvested awards | $					$ 8,500		$ 8,500
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition							12 months
Total fair value of vested shares | $							$ 6,800	6,000
Proceeds from exercise of stock options | $							1,466	3,444
Tax benefit realized from exercise of stock options | $							$ 1,100	$ 1,800
Shares available for issuance under the Plan (in shares)					2,200,000		2,200,000
Stock options granted (in shares)							182,800	264,300
Options, Additional Disclosures:
Options granted, weighted-average grant-date fair value (in USD per share) | $ / shares							$ 21.20	$ 21.75
Options exercised, aggregate intrinsic value | $							$ 1,200
Performance Shares
Share-based Compensation, Aggregate Disclosures:
Granted in period to each independent director (in shares)		35,593
Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Granted in period to each independent director (in shares)	2,564	54,773					105,800	68,400
Restricted Shares
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares							$ 55.61	$ 55.44
Stock Options
Share-based Compensation, Aggregate Disclosures:
Stock options granted (in shares)	1	182,823
Stock options granted, exercise price (in USD per share) | $ / shares		$ 56.11
Stock Options | Minimum
Restricted Shares
Award vesting period							3 years
Stock Options | Maximum
Restricted Shares
Award vesting period							5 years
Options, Additional Disclosures:
Award exercisability period, from date of grant							10 years
Employee | Restricted Stock Units (RSUs)
Restricted Shares
Award vesting period							3 years
Employee | Restricted Stock Units (RSUs) | Maximum
Restricted Shares
Award vesting period							3 years
Director | Restricted Stock Units (RSUs)
Restricted Shares
Number of common shares into which each RSU may be converted (in shares)							1
Period following director's term in which RSUs may be settled							6 months
Long-term Equity Incentive Plan, 2005
Share-based Compensation, Aggregate Disclosures:
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares)			5,000,000.0
Number of additional shares authorized (in shares)				1,800,000.0

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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