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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital Adjustment	Additional Paid-In Capital	Retained Earnings Adjustment	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Adjustment	Total
Balances at Dec. 31, 2015	$ 279		$ 309,653		$ 376,827	$ (70,535)	$ (27,496)		$ 588,728
Balances (in shares) at Dec. 31, 2015	27,938					2,080
Increase (Decrease) in Stockholders' Equity
Net income					18,652				18,652
Other comprehensive income, net of tax							4,079		4,079
Issuance of common stock under share-based compensation plans	$ 3		(3)
Issuance of common stock under share-based compensation plans (in shares)	236
Tax effect of share-based compensation plans			(2,322)						(2,322)
Share-based compensation expense			7,588						7,588
Purchase of treasury stock						$ (9,510)			(9,510)
Purchase of treasury stock (in shares)						485
Dividends declared on common stock					(8,318)				(8,318)
Balances at Dec. 31, 2016	$ 282		315,318		386,917	$ (80,045)	(23,417)		599,055
Balances (in shares) at Dec. 31, 2016	28,174					2,565
Increase (Decrease) in Stockholders' Equity
Adjustments to beginning retained earnings for adoption of accounting standards | ASC Topic 718, Compensation – Stock Compensation		$ 402		$ (244)				$ 158
Net income					59,726				59,726
Other comprehensive income, net of tax							2,843		2,843
Issuance of common stock under share-based compensation plans	$ 3		(3)
Issuance of common stock under share-based compensation plans (in shares)	322
Tax effect of share-based compensation plans			(2,837)						(2,837)
Share-based compensation expense			6,958						6,958
Purchase of treasury stock						$ (6,019)			(6,019)
Purchase of treasury stock (in shares)						287
Dividends declared on common stock					(8,264)				(8,264)
Balances at Dec. 31, 2017	$ 285		319,436		438,379	$ (86,064)	(20,574)		651,462
Balances (in shares) at Dec. 31, 2017	28,496					2,852
Increase (Decrease) in Stockholders' Equity
Adjustments to beginning retained earnings for adoption of accounting standards | ASC Topic 606 and ASC Topic 220					3,992		(3,576)		416
Adjusted Balances	$ 285		319,436		442,371	$ (86,064)	(24,150)		651,878
Net income					67,262				67,262
Other comprehensive income, net of tax							9,912		9,912
Issuance of common stock under share-based compensation plans	$ 2		(2)
Issuance of common stock under share-based compensation plans (in shares)	189
Tax effect of share-based compensation plans			(2,135)						(2,135)
Share-based compensation expense			8,413						8,413
Purchase of treasury stock						$ (9,404)			(9,404)
Purchase of treasury stock (in shares)						246
Dividends declared on common stock					(8,244)				(8,244)
Balances at Dec. 31, 2018	$ 287		$ 325,712		$ 501,389	$ (95,468)	$ (14,238)		$ 717,682
Balances (in shares) at Dec. 31, 2018	28,685					3,098

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