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, 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)	22,053,275	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)