Consolidated Statement of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balances at Dec. 31, 2018	$ 620,450	$ 460	$ 816,500	$ (179,660)	$ (16,850)
Net income (loss)	98,620			98,620
Other comprehensive income	12,120				12,120
Purchase of common stock	(36,740)	(10)	(36,730)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(3,340)		(3,340)
Non-cash compensation expense	6,450		6,450
Impact of accounting standards adoption	(80)			1,190	(1,270)
Balances at Dec. 31, 2019	697,480	450	782,880	(79,850)	(6,000)
Net income (loss)	(79,760)			(79,760)
Other comprehensive income	380				380
Purchase of common stock	(39,420)	(30)	(39,390)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(2,600)		(2,600)
Non-cash compensation expense	8,170	10	8,160
Balances at Dec. 31, 2020	584,250	430	749,050	(159,610)	(5,620)
Net income (loss)	57,310			57,310
Other comprehensive income	5,850				5,850
Purchase of common stock	(19,090)	0	(19,090)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(5,230)		(5,230)
Non-cash compensation expense	9,500	0	9,500
Dividends declared	(1,740)		(1,740)	0
Balances at Dec. 31, 2021	$ 630,850	$ 430	$ 732,490	$ (102,300)	$ 230