Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE - value at Dec. 31, 2019	$ 279,399	$ 6	$ 302,189	$ (23,091)	$ 295
BALANCE - shares at Dec. 31, 2019		64,283
Share-based compensation, value	1,675		1,675
Share-based compensation, shares		39
Vesting of restricted stock units and impact of shares withheld for taxes, value	(1,928)		(1,928)
Vesting of restricted stock units and impact of shares withheld for taxes, shares		388
Exercise of stock options and purchases from employee stock purchase plan, value	622		622
Exercise of stock options and purchases from employee stock purchase plan, shares		85
Net income	33,987			33,987
Other comprehensive income (loss)—net of tax	(7,126)				(7,126)
BALANCE - value at Mar. 31, 2020	306,629	$ 6	302,558	10,896	(6,831)
BALANCE - shares at Mar. 31, 2020		64,795
BALANCE - value at Dec. 31, 2020	346,668	$ 6	304,757	40,937	968
BALANCE - shares at Dec. 31, 2020		65,023
Share-based compensation, value	1,766		1,766
Share-based compensation, shares		63
Vesting of restricted stock units and impact of shares withheld for taxes, value	(3,784)		(3,784)
Vesting of restricted stock units and impact of shares withheld for taxes, shares		410
Exercise of stock options and purchases from employee stock purchase plan, value	1,260		1,260
Exercise of stock options and purchases from employee stock purchase plan, shares		124
Net income	8,814			8,814
Other comprehensive income (loss)—net of tax	1,886				1,886
BALANCE - value at Mar. 31, 2021	$ 356,610	$ 6	$ 303,999	$ 49,751	$ 2,854
BALANCE - shares at Mar. 31, 2021		65,620