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, 2019		52,079
Balance at Dec. 31, 2019	$ 290,140	$ 208	$ 3,631	$ 286,301
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,853			21,853
Stock options exercised and restricted stock awards granted (in shares)		212
Stock options exercised and restricted stock awards granted	4,497	$ 1	4,496
Share-based compensation	2,351		2,351
Stock repurchased and retired (in shares)		(247)
Stock repurchased and retired	(12,518)	$ (1)	(10,478)	(2,039)
Balance (in shares) at Mar. 31, 2020		52,044
Balance at Mar. 31, 2020	306,323	$ 208	0	306,115
Balance (in shares) at Dec. 31, 2020		52,225
Balance at Dec. 31, 2020	350,865	$ 209	5,161	345,495
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,376			16,376
Stock options exercised and restricted stock awards granted (in shares)		286
Stock options exercised and restricted stock awards granted	9,438	$ 2	9,436
Share-based compensation	2,761		2,761
Stock repurchased and retired (in shares)		(87)
Stock repurchased and retired	(6,402)	$ (1)	(6,401)
Balance (in shares) at Mar. 31, 2021		52,424
Balance at Mar. 31, 2021	$ 373,038	$ 210	$ 10,957	$ 361,871