Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings
Balance (in shares) at Dec. 31, 2018		51,991
Balance at Dec. 31, 2018	$ 249,443	$ 208	$ 0	$ 249,235
Net income	53,711			53,711
Stock options exercised and restricted stock awards granted (in shares)		542
Stock options exercised and restricted stock awards granted	12,625	$ 2	12,623
Share-based compensation	11,799		11,799
Stock repurchased and retired (in shares)		(454)
Stock repurchased and retired	(20,793)	$ (2)	(20,791)
Dividends	(16,645)			(16,645)
Balance (in shares) at Dec. 31, 2019		52,079
Balance at Dec. 31, 2019	290,140	$ 208	3,631	286,301
Net income	79,009			79,009
Stock options exercised and restricted stock awards granted (in shares)		712
Stock options exercised and restricted stock awards granted	21,418	$ 3	21,415
Share-based compensation	11,342		11,342
Stock repurchased and retired (in shares)		(566)
Stock repurchased and retired	(31,229)	$ (2)	(31,227)	0
Dividends	(19,815)			(19,815)
Balance (in shares) at Dec. 31, 2020		52,225
Balance at Dec. 31, 2020	350,865	$ 209	5,161	345,495
Net income	58,758			58,758
Stock options exercised and restricted stock awards granted (in shares)		623
Stock options exercised and restricted stock awards granted	21,148	$ 2	21,146
Share-based compensation	11,812		11,812
Stock repurchased and retired (in shares)		(320)
Stock repurchased and retired	(22,466)	$ (1)	(22,465)
Contingent consideration (Note 4)	66,000		66,000
Dividends	(19,947)			(19,947)
Balance (in shares) at Dec. 31, 2021		52,528
Balance at Dec. 31, 2021	$ 466,170	$ 210	$ 81,654	$ 384,306