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, 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)	13,747
Other comprehensive income (loss)	(26,176)
Balances, in shares at Sep. 30, 2020			243,745
Balances at Sep. 30, 2020	664,227		$ 2,437		3,608,102		(2,920,000)	(26,312)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(1,209)						(1,209)
Other comprehensive income (loss)	(7,776)							(7,776)
Common stock issued under stock-based compensation plans, net (in shares)			146
Common stock issued/canceled under long-term incentive plans and director fees and options, net	2,198		$ 1		2,197
Balances, in shares at Jun. 30, 2020			243,732
Balances at Jun. 30, 2020	653,857		$ 2,437		3,605,982		(2,946,856)	(7,706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	26,856						26,856
Other comprehensive income (loss)	(18,606)							(18,606)
Common stock issued under stock-based compensation plans, net (in shares)			13
Common stock issued/canceled under long-term incentive plans and director fees and options, net	2,120		$ 0		2,120
Balances, in shares at Sep. 30, 2020			243,745
Balances at Sep. 30, 2020	664,227		$ 2,437		3,608,102		(2,920,000)	(26,312)
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
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)	(20,562)
Other comprehensive income (loss)	16,040
Balances, in shares at Sep. 30, 2021			256,929
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
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
Common stock issued for investment	118,777		$ 128		118,649
Common stock issued under stock-based compensation plans, net (in shares)			792
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
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)
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
Balances at Sep. 30, 2021	$ 813,739		$ 2,569		$ 3,734,948		$ (2,928,682)	$ 4,904