CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings (Deficit)
Balance at Dec. 31, 2018	$ 615,568	$ 439	$ 642,590	$ (11,893)	$ (15,568)
Balance (in shares) at Dec. 31, 2018		43,917,378
Net income	8,053				8,053
Exercise of stock options and releases of restricted stock	44	$ 2	42
Exercise of stock options and releases of restricted stock (in shares)		156,620
Stock-based compensation expense	3,251		3,251
Translation adjustment at Dec. 31, 2018	(1,891)			(1,891)
Balance at Mar. 31, 2019	625,025	$ 441	645,883	(13,784)	(7,515)
Balance (in shares) at Mar. 31, 2019		44,073,998
Balance at Dec. 31, 2019	1,059,768	$ 521	1,068,431	(15,027)	5,843
Balance (in shares) at Dec. 31, 2019		52,078,258
Net income	9,815				9,815
Exercise of stock options and releases of restricted stock	1,589	$ 2	1,587
Exercise of stock options and releases of restricted stock (in shares)		199,825
Stock-based compensation expense	4,165		4,165
Translation adjustment at Dec. 31, 2019	(5,579)			(5,579)
Balance at Mar. 31, 2020	$ 1,069,758	$ 523	$ 1,074,183	$ (20,606)	$ 15,658
Balance (in shares) at Mar. 31, 2020		52,278,083