CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated (Deficit) Earnings	Accumulated Other Comprehensive Income
Balance at period start (in shares) at Dec. 31, 2021		60,162
Balance at period start at Dec. 31, 2021	$ 265,700	$ 602	$ 821,713	$ (559,117)	$ 2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		412
Stock-based compensation	3,658	$ 3	3,655
Purchase of common stock for retirement (in shares)		(462)
Purchase of common stock for retirement	(6,390)	$ (4)	(1,431)	(4,955)
Net loss (income)	(137,051)			(137,051)
Balance at period end (in shares) at Mar. 31, 2022		60,112
Balance at period end at Mar. 31, 2022	125,917	$ 601	823,937	(701,123)	2,502
Balance at period start (in shares) at Dec. 31, 2021		60,162
Balance at period start at Dec. 31, 2021	265,700	$ 602	821,713	(559,117)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss (income)	279,470
Balance at period end (in shares) at Sep. 30, 2022		60,158
Balance at period end at Sep. 30, 2022	546,892	$ 601	829,195	(285,406)	2,502
Balance at period start (in shares) at Mar. 31, 2022		60,112
Balance at period start at Mar. 31, 2022	125,917	$ 601	823,937	(701,123)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		41
Issuance of common stock for employee stock purchase plan	632		632
Stock-based compensation (in shares)		3
Stock-based compensation	2,017		2,017
Purchase of common stock for retirement (in shares)		(1)
Purchase of common stock for retirement	(94)		(94)
Exercise of stock options (in shares)		65
Exercise of stock options	1,132	$ 1	1,131
Net loss (income)	149,125			149,125
Balance at period end (in shares) at Jun. 30, 2022		60,220
Balance at period end at Jun. 30, 2022	278,729	$ 602	827,623	(551,998)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		(2)
Stock-based compensation	1,613		1,613
Purchase of common stock for retirement (in shares)		(60)
Purchase of common stock for retirement	(846)	$ (1)	(41)	(804)
Net loss (income)	267,396			267,396
Balance at period end (in shares) at Sep. 30, 2022		60,158
Balance at period end at Sep. 30, 2022	546,892	$ 601	829,195	(285,406)	2,502
Balance at period start (in shares) at Dec. 31, 2022		60,471
Balance at period start at Dec. 31, 2022	644,537	$ 604	836,491	(200,687)	8,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		340
Stock-based compensation	2,317		2,317
Purchase of common stock for retirement (in shares)		(81)
Purchase of common stock for retirement	(3,114)		(3,114)
Exercise of stock options (in shares)		300
Exercise of stock options	6,374	$ 6	6,368
Other comprehensive loss	(11)				(11)
Net loss (income)	237,890			237,890
Balance at period end (in shares) at Mar. 31, 2023		61,030
Balance at period end at Mar. 31, 2023	887,993	$ 610	842,062	37,203	8,118
Balance at period start (in shares) at Dec. 31, 2022		60,471
Balance at period start at Dec. 31, 2022	644,537	$ 604	836,491	(200,687)	8,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss (income)	439,318
Balance at period end (in shares) at Sep. 30, 2023		60,518
Balance at period end at Sep. 30, 2023	1,071,259	$ 605	853,835	208,724	8,095
Balance at period start (in shares) at Mar. 31, 2023		61,030
Balance at period start at Mar. 31, 2023	887,993	$ 610	842,062	37,203	8,118
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		27
Issuance of common stock for employee stock purchase plan	726		726
Stock-based compensation (in shares)		115
Stock-based compensation	3,656	$ 1	3,655
Purchase of common stock for retirement (in shares)		(128)
Purchase of common stock for retirement	(3,066)	$ (1)	(464)	(2,601)
Other comprehensive loss	(11)				(11)
Net loss (income)	30,013			30,013
Balance at period end (in shares) at Jun. 30, 2023		61,044
Balance at period end at Jun. 30, 2023	919,311	$ 610	845,979	64,615	8,107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		7
Stock-based compensation	2,874	$ 3	2,871
Purchase of common stock for retirement (in shares)		(784)
Purchase of common stock for retirement	(28,969)	$ (8)	(1,655)	(27,306)
Exercise of stock options (in shares)		251
Exercise of stock options	6,640		6,640
Other comprehensive loss	(12)				(12)
Net loss (income)	171,415			171,415
Balance at period end (in shares) at Sep. 30, 2023		60,518
Balance at period end at Sep. 30, 2023	$ 1,071,259	$ 605	$ 853,835	$ 208,724	$ 8,095