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	10,856		10,856
Shares repurchased and retired, value	(40,216)	$ (137)	(15,364)	(24,715)
Shares repurchased and retired, shares		(1,380)
Stock options exercised, value	346	$ 3	343
Stock options exercised, shares		29
Vesting of restricted stock units, value		$ 37	(37)
Vesting of restricted stock units, shares		373
Shares withheld for taxes, value	(3,152)	$ (11)	(3,141)
Shares withheld for taxes, shares		(108)
Dividends declared	(17,456)			(17,456)
Net income	23,351			23,351
Other comprehensive income loss	(981)				(981)
Ending Balances, value at Sep. 30, 2021	962,336	$ 3,521	503,062	473,385	(17,632)
End Balances, shares at Sep. 30, 2021		35,209
Beginning Balances, value at Jun. 30, 2021	967,278	$ 3,558	503,386	476,855	(16,521)
Balances, shares at Jun. 30, 2021		35,566
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	3,993		3,993
Shares repurchased and retired, value	(9,897)	$ (38)	(4,137)	(5,722)
Shares repurchased and retired, shares		(372)
Vesting of restricted stock units, value		$ 2	(2)
Vesting of restricted stock units, shares		22
Shares withheld for taxes, value	(179)	$ (1)	(178)
Shares withheld for taxes, shares		(7)
Dividends declared	(5,813)			(5,813)
Net income	8,065			8,065
Other comprehensive income loss	(1,111)				(1,111)
Ending Balances, value at Sep. 30, 2021	962,336	$ 3,521	503,062	473,385	(17,632)
End Balances, shares at Sep. 30, 2021		35,209
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	$ 13,282		13,282
Shares repurchased and retired, value	(9,391)	$ (37)	(4,177)	(5,177)
Shares repurchased and retired, shares		(376)
Stock options exercised, value	$ 471	$ 3	468
Stock options exercised, shares	40	33
Vesting of restricted stock units, value		$ 41	(41)
Vesting of restricted stock units, shares		407
Shares withheld for taxes, value	$ (3,184)	$ (13)	(3,171)
Shares withheld for taxes, shares		(124)
Dividends declared	(17,406)			(17,406)
Net income	47,010			47,010
Other comprehensive income loss	(3,967)				(3,967)
Ending Balances, value at Sep. 30, 2022	$ 1,000,617	$ 3,515	513,808	504,419	(21,125)
End Balances, shares at Sep. 30, 2022	35,153	35,153
Beginning Balances, value at Jun. 30, 2022	$ 985,773	$ 3,514	509,172	491,379	(18,292)
Balances, shares at Jun. 30, 2022		35,140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	4,795		4,795
Stock options exercised, value	12		12
Stock options exercised, shares		1
Vesting of restricted stock units, value		$ 2	(2)
Vesting of restricted stock units, shares		18
Shares withheld for taxes, value	(170)	$ (1)	(169)
Shares withheld for taxes, shares		(6)
Dividends declared	(5,789)			(5,789)
Net income	18,829			18,829
Other comprehensive income loss	(2,833)				(2,833)
Ending Balances, value at Sep. 30, 2022	$ 1,000,617	$ 3,515	$ 513,808	$ 504,419	$ (21,125)
End Balances, shares at Sep. 30, 2022	35,153	35,153