Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balances, value at Dec. 31, 2019	$ 1,014,832	$ 3,696	$ 512,019	$ 515,876	$ (16,759)
Balances, shares at Dec. 31, 2019		36,957
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,739		2,739
Shares repurchased and retired, value	(19,329)	$ (73)	(8,048)	(11,208)
Shares repurchased and retired, shares		(724)
Stock options exercised, value	359	$ 2	357
Stock options exercised, shares		16
Vesting of restricted stock units, value		$ 24	(24)
Vesting of restricted stock units, shares		236
Shares withheld for taxes, value	(1,767)	$ (7)	(1,760)
Shares withheld for taxes, shares		(70)
Dividends declared	(5,828)			(5,828)
Net income	3,852			3,852
Other comprehensive income (loss)	(5,236)				(5,236)
Ending Balances, value at Mar. 31, 2020	989,622	$ 3,642	505,283	502,692	(21,995)
Balances, shares at Mar. 31, 2020		36,415
Beginning Balances, value at Dec. 31, 2020	$ 989,588	$ 3,629	510,405	492,205	(16,651)
Balances, shares at Dec. 31, 2020	36,295	36,295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 2,850		2,850
Shares repurchased and retired, value	(13,052)	$ (41)	(4,928)	(8,083)
Shares repurchased and retired, shares		(442)
Stock options exercised, value	$ 276	$ 2	274
Stock options exercised, shares	46	25
Vesting of restricted stock units, value		$ 28	(28)
Vesting of restricted stock units, shares		284
Shares withheld for taxes, value	$ (2,924)	$ (10)	(2,914)
Shares withheld for taxes, shares		(100)
Dividends declared	(5,772)			(5,772)
Net income	7,917			7,917
Other comprehensive income (loss)	(1,336)				(1,336)
Ending Balances, value at Mar. 31, 2021	$ 977,547	$ 3,608	$ 505,659	$ 486,267	$ (17,987)
Balances, shares at Mar. 31, 2021	36,062	36,062