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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2018	May 07, 2018	May 31, 2014	Jun. 30, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
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					$ 1,900	$ 2,200	$ 6,200	$ 6,900
Tax benefit (expense) recognized from share-based compensation expense					300	$ (100)	1,100	1,400
Unrecognized compensation costs related to nonvested awards					$ 7,600		$ 7,600
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition							1 year
Total fair value of vested shares							$ 12,000	6,800
Proceeds from exercise of stock options							2,931	1,466
Tax benefit realized from exercise of stock options							$ 1,300	$ 1,100
Shares available for issuance under the Plan (in shares)					1,800,000		1,800,000
Stock options granted (in shares)							294,500	182,800
Options, Additional Disclosures:
Options granted, weighted-average grant-date fair value (in USD per share)							$ 10.22	$ 21.20
Options exercised, aggregate intrinsic value							$ 800
Performance Shares
Share-based Compensation, Aggregate Disclosures:
Share grants in period (in shares)		103,406
Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Share grants in period (in shares)		100,399					226,400	105,800
Restricted Stock Units (RSUs) | Employee
Restricted Shares
Award vesting period							3 years
Restricted Stock Units (RSUs) | Employee | Maximum
Restricted Shares
Award vesting period							3 years
Restricted Stock Units (RSUs) | Director
Share-based Compensation, Aggregate Disclosures:
Share grants in period (in shares)	3,779
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
Stock Options
Share-based Compensation, Aggregate Disclosures:
Stock options granted (in shares)		294,484
Stock options granted, exercise price (in USD per share)		$ 29.46
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
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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