Consolidated Statement of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balances at Dec. 31, 2019	$ 697,480	$ 450	$ 782,880	$ (79,850)	$ (6,000)
Net income	13,120			13,120
Other comprehensive income (loss)	(3,680)				(3,680)
Purchase of common stock	(31,570)	(20)	(31,550)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(1,830)		(1,830)
Non-cash compensation expense	1,940		1,940
Balances at Mar. 31, 2020	675,460	430	751,440	(66,730)	(9,680)
Balances at Dec. 31, 2020	584,250	430	749,050	(159,610)	(5,620)
Net income	13,060			13,060
Other comprehensive income (loss)	630				630
Purchase of common stock	(2,640)	0	(2,640)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(1,770)		(1,770)
Non-cash compensation expense	2,440		2,440
Balances at Mar. 31, 2021	$ 595,970	$ 430	$ 747,080	$ (146,550)	$ (4,990)