Consolidated Statements of Shareholders' Equity - 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, 2018	$ 1,132,225	$ 4,136	$ 554,939	$ 584,274	$ (11,124)
Balances, shares at Dec. 31, 2018		41,357
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	10,194		10,194
Shares repurchased and retired, value	(122,110)	$ (472)	(52,436)	(69,202)
Shares repurchased and retired, shares		(4,719)
Stock options exercised, value	$ 1,585	$ 8	1,577
Stock options exercised, shares	100	82
Vesting of restricted stock units, value		$ 31	(31)
Vesting of restricted stock units, shares		311
Shares withheld for taxes, value	$ (2,231)	$ (7)	(2,224)
Shares withheld for taxes, shares		(74)
Dividends declared	(22,621)			(22,621)
Net income	23,425			23,425
Other comprehensive income (loss)	(5,635)				(5,635)
Ending 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	10,398		10,398
Shares repurchased and retired, value	(25,220)	$ (97)	(10,704)	(14,419)
Shares repurchased and retired, shares		(964)
Stock options exercised, value	$ 958	$ 5	953
Stock options exercised, shares	76	55
Vesting of restricted stock units, value		$ 34	(34)
Vesting of restricted stock units, shares		336
Shares withheld for taxes, value	$ (2,236)	$ (9)	(2,227)
Shares withheld for taxes, shares		(89)
Dividends declared	(23,307)			(23,307)
Net income	14,055			14,055
Other comprehensive income (loss)	108				108
Ending 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	$ 15,262		15,262
Shares repurchased and retired, value	(40,216)	$ (138)	(15,362)	(24,716)
Shares repurchased and retired, shares		(1,380)
Stock options exercised, value	$ 346	$ 3	343
Stock options exercised, shares	54	30
Vesting of restricted stock units, value		$ 38	(38)
Vesting of restricted stock units, shares		377
Shares withheld for taxes, value	$ (3,174)	$ (11)	(3,163)
Shares withheld for taxes, shares		(109)
Dividends declared	(23,267)			(23,267)
Net income	35,770			35,770
Other comprehensive income (loss)	(507)				(507)
Ending 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