Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	JDS Silver	Common Stock	Common Stock JDS Silver	Additional Paid-In Capital	Additional Paid-In Capital JDS Silver	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances, in shares at Dec. 31, 2019			241,529
Balances at Dec. 31, 2019	$ 667,004		$ 2,415		$ 3,598,472		$ (2,933,747)	$ (136)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(11,900)						(11,900)
Other comprehensive income (loss)	206							206
Common stock issued under stock-based compensation plans, net (in shares)			1,179
Common stock issued/canceled under long-term incentive plans and director fees and options, net	39		$ 12		27
Common stock issued for Silvertip contingent consideration payment (in shares)				878
Common stock issued for Silvertip contingent consideration payment		$ 5,295		$ 9		$ 5,286
Balances, in shares at Mar. 31, 2020			243,586
Balances at Mar. 31, 2020	660,644		$ 2,436		3,603,785		(2,945,647)	70
Balances, in shares at Dec. 31, 2020			243,752
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)
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
Balances at Mar. 31, 2021	$ 720,506		$ 2,435		$ 3,610,631		$ (2,906,060)	$ 13,500