STATEMENT OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning balance at Dec. 31, 2018		$ 28	$ 126,164	$ (1,689)	$ 402,569
Common stock issued under employee stock plans		0	4,500
Repurchase of common stock		0	(7,302)
Stock-based compensation			4,407
Other comprehensive income (loss)	$ 328			328
Net income	7,233
Payment of dividends to stockholders					(4,937)
Ending balance at Mar. 31, 2019	531,301	28	127,769	(1,361)	404,865
Beginning balance at Dec. 31, 2019	724,546	28	152,117	(3,130)	575,531
Common stock issued under employee stock plans		0	5,529
Repurchase of common stock	(2,000)	0	(2,013)
Stock-based compensation			6,710
Other comprehensive income (loss)	(1,184)			(1,184)
Net income	15,886
Payment of dividends to stockholders					(5,644)
Ending balance at Mar. 31, 2020	$ 743,830	$ 28	$ 162,343	$ (4,314)	$ 585,773