Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances, in shares at Dec. 31, 2020		243,752,000
Balances at Dec. 31, 2020	$ 693,479	$ 2,438	$ 3,610,297	$ (2,908,120)	$ (11,136)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,060			2,060
Other comprehensive income (loss)	24,636				24,636
Common stock issued under stock-based compensation plans, net (in shares)		(282,000)
Common stock issued/canceled under long-term incentive plans and director fees and options, net	331	$ (3)	334
Balances, in shares at Mar. 31, 2021		243,470,000
Balances at Mar. 31, 2021	720,506	$ 2,435	3,610,631	(2,906,060)	13,500
Balances, in shares at Dec. 31, 2020		243,752,000
Balances at Dec. 31, 2020	693,479	$ 2,438	3,610,297	(2,908,120)	(11,136)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(20,562)
Other comprehensive income (loss)	16,040
Balances, in shares at Sep. 30, 2021		256,929,000
Balances at Sep. 30, 2021	813,739	$ 2,569	3,734,948	(2,928,682)	4,904
Balances, in shares at Mar. 31, 2021		243,470,000
Balances at Mar. 31, 2021	720,506	$ 2,435	3,610,631	(2,906,060)	13,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	32,146			32,146
Other comprehensive income (loss)	(6,043)				(6,043)
Common stock issued for investment (in shares)		12,786,000
Common stock issued under "at the market" stock offering	118,777	$ 128	118,649
Common stock issued under stock-based compensation plans, net (in shares)		792,000
Common stock issued/canceled under long-term incentive plans and director fees and options, net	3,023	$ 7	3,016
Balances, in shares at Jun. 30, 2021		257,048,000
Balances at Jun. 30, 2021	868,409	$ 2,570	3,732,296	(2,873,914)	7,457
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(54,768)			(54,768)
Other comprehensive income (loss)	(2,553)				(2,553)
Common stock issued under stock-based compensation plans, net (in shares)		(119,000)
Common stock issued/canceled under long-term incentive plans and director fees and options, net	2,651	$ (1)	2,652
Balances, in shares at Sep. 30, 2021		256,929,000
Balances at Sep. 30, 2021	813,739	$ 2,569	3,734,948	(2,928,682)	4,904
Balances, in shares at Dec. 31, 2021		256,919,000
Balances at Dec. 31, 2021	800,262	$ 2,569	3,738,347	(2,939,442)	(1,212)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,682			7,682
Other comprehensive income (loss)	(4,758)				(4,758)
Common stock issued for investment (in shares)		22,053,000
Common stock issued under "at the market" stock offering	98,499	$ 220	98,279
Common stock issued under stock-based compensation plans, net (in shares)		1,862,000
Common stock issued/canceled under long-term incentive plans and director fees and options, net	(1,711)	$ 19	(1,730)
Balances, in shares at Mar. 31, 2022		280,834,000
Balances at Mar. 31, 2022	899,974	$ 2,808	3,834,896	(2,931,760)	(5,970)
Balances, in shares at Dec. 31, 2021		256,919,000
Balances at Dec. 31, 2021	800,262	$ 2,569	3,738,347	(2,939,442)	(1,212)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(127,196)
Other comprehensive income (loss)	$ 46,906
Common stock issued for investment (in shares)	22,053,275
Balances, in shares at Sep. 30, 2022		280,836,000
Balances at Sep. 30, 2022	$ 821,589	$ 2,808	3,839,725	(3,066,638)	45,694
Balances, in shares at Mar. 31, 2022		280,834,000
Balances at Mar. 31, 2022	899,974	$ 2,808	3,834,896	(2,931,760)	(5,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(77,434)			(77,434)
Other comprehensive income (loss)	32,514				32,514
Common stock issued under stock-based compensation plans, net (in shares)		(29,000)
Common stock issued/canceled under long-term incentive plans and director fees and options, net	2,127	$ 0	2,127
Balances, in shares at Jun. 30, 2022		280,805,000
Balances at Jun. 30, 2022	857,181	$ 2,808	3,837,023	(3,009,194)	26,544
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(57,444)			(57,444)
Other comprehensive income (loss)	19,150				19,150
Common stock issued under stock-based compensation plans, net (in shares)		31,000
Common stock issued/canceled under long-term incentive plans and director fees and options, net	2,702	$ 0	2,702
Balances, in shares at Sep. 30, 2022		280,836,000
Balances at Sep. 30, 2022	$ 821,589	$ 2,808	$ 3,839,725	$ (3,066,638)	$ 45,694