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, 2018	$ 620,450	$ 460	$ 816,500	$ (179,660)	$ (16,850)
Net income	19,090			19,090
Other comprehensive income (loss)	3,020				3,020
Purchase of common stock	(670)		(670)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(2,620)		(2,620)
Non-cash compensation expense	1,320		1,320
Impact of accounting standards adoption	(80)			1,190	(1,270)
Balances at Mar. 31, 2019	640,510	460	814,530	(159,380)	(15,100)
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)