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, 2020	$ 989,588	$ 3,629	$ 510,405	$ 492,205	$ (16,651)
Balances, shares at Dec. 31, 2020		36,295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	6,863		6,863
Shares repurchased and retired, value	(30,319)	$ (99)	(11,227)	(18,993)
Shares repurchased and retired, shares		(1,008)
Stock options exercised, value	346	$ 3	343
Stock options exercised, shares		29
Vesting of restricted stock units, value		$ 35	(35)
Vesting of restricted stock units, shares		351
Shares withheld for taxes, value	(2,973)	$ (10)	(2,963)
Shares withheld for taxes, shares		(101)
Dividends declared	(11,643)			(11,643)
Net income	15,286			15,286
Other comprehensive income loss	130				130
Ending Balances, value at Jun. 30, 2021	967,278	$ 3,558	503,386	476,855	(16,521)
End Balances, shares at Jun. 30, 2021		35,566
Beginning Balances, value at Mar. 31, 2021	977,547	$ 3,608	505,659	486,267	(17,987)
Balances, shares at Mar. 31, 2021		36,062
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	4,013		4,013
Shares repurchased and retired, value	(17,267)	$ (57)	(6,300)	(10,910)
Shares repurchased and retired, shares		(567)
Stock options exercised, value	70		70
Stock options exercised, shares		4
Vesting of restricted stock units, value		$ 7	(7)
Vesting of restricted stock units, shares		69
Shares withheld for taxes, value	(49)		(49)
Shares withheld for taxes, shares		(2)
Dividends declared	(5,871)			(5,871)
Net income	7,369			7,369
Other comprehensive income loss	1,466				1,466
Ending Balances, value at Jun. 30, 2021	967,278	$ 3,558	503,386	476,855	(16,521)
End Balances, shares at Jun. 30, 2021		35,566
Beginning Balances, value at Dec. 31, 2021	$ 973,802	$ 3,521	507,447	479,992	(17,158)
Balances, shares at Dec. 31, 2021	35,213	35,213
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 8,487		8,487
Shares repurchased and retired, value	(9,391)	$ (37)	(4,177)	(5,177)
Shares repurchased and retired, shares		(376)
Stock options exercised, value	$ 459	$ 3	456
Stock options exercised, shares	39	32
Vesting of restricted stock units, value		$ 39	(39)
Vesting of restricted stock units, shares		388
Shares withheld for taxes, value	$ (3,014)	$ (12)	(3,002)
Shares withheld for taxes, shares		(117)
Dividends declared	(11,617)			(11,617)
Net income	28,181			28,181
Other comprehensive income loss	(1,134)				(1,134)
Ending Balances, value at Jun. 30, 2022	$ 985,773	$ 3,514	509,172	491,379	(18,292)
End Balances, shares at Jun. 30, 2022	35,140	35,140
Beginning Balances, value at Mar. 31, 2022	$ 976,405	$ 3,526	506,714	482,052	(15,887)
Balances, shares at Mar. 31, 2022		35,261
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	4,281		4,281
Shares repurchased and retired, value	(3,909)	$ (16)	(1,802)	(2,091)
Shares repurchased and retired, shares		(162)
Vesting of restricted stock units, value		$ 4	(4)
Vesting of restricted stock units, shares		42
Shares withheld for taxes, value	(17)		(17)
Shares withheld for taxes, shares		(1)
Dividends declared	(5,803)			(5,803)
Net income	17,221			17,221
Other comprehensive income loss	(2,405)				(2,405)
Ending Balances, value at Jun. 30, 2022	$ 985,773	$ 3,514	$ 509,172	$ 491,379	$ (18,292)
End Balances, shares at Jun. 30, 2022	35,140	35,140