Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	JDS Silver [Member]	JDS Silver [Member] Common Stock	JDS Silver [Member] Additional Paid-In Capital
Balances at Dec. 31, 2018	$ 852,512	$ 2,033	$ 3,443,082	$ (2,592,544)	$ (59)
Balances, in shares at Dec. 31, 2018		203,310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(19,201)			(19,201)
Other comprehensive income (loss)	59				59
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,801
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(1,035)	$ 18	(1,053)
Balances at Mar. 31, 2019	832,335	$ 2,051	3,442,029	(2,611,745)	0
Balances, in shares at Mar. 31, 2019		205,111
Balances at Dec. 31, 2018	852,512	$ 2,033	3,443,082	(2,592,544)	(59)
Balances, in shares at Dec. 31, 2018		203,310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(55,965)
Other comprehensive income (loss)	59
Balances at Jun. 30, 2019	846,446	$ 2,219	3,492,736	(2,648,509)	0
Balances, in shares at Jun. 30, 2019		221,859
Balances at Mar. 31, 2019	832,335	$ 2,051	3,442,029	(2,611,745)	0
Balances, in shares at Mar. 31, 2019		205,111
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(36,764)			(36,764)
Other comprehensive income (loss)	0
Stock Issued During Period, Shares, New Issues		16,631
Stock Issued During Period, Value, New Issues	48,887	$ 166	48,721
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		117
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	1,988	$ 2	1,986
Balances at Jun. 30, 2019	846,446	$ 2,219	3,492,736	(2,648,509)	0
Balances, in shares at Jun. 30, 2019		221,859
Balances at Dec. 31, 2019	667,004	$ 2,415	3,598,472	(2,933,747)	(136)
Balances, in shares at Dec. 31, 2019		241,529
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(11,900)			(11,900)
Other comprehensive income (loss)	206				206
Stock Issued During Period, Shares, Acquisitions							878
Stock Issued During Period, Value, Acquisitions						$ 5,295	$ 9	$ 5,286
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,179
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	39	$ 12	27
Balances at Mar. 31, 2020	660,644	$ 2,436	3,603,785	(2,945,647)	70
Balances, in shares at Mar. 31, 2020		243,586
Balances at Dec. 31, 2019	667,004	$ 2,415	3,598,472	(2,933,747)	(136)
Balances, in shares at Dec. 31, 2019		241,529
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(13,109)			(13,109)
Other comprehensive income (loss)	(7,570)
Balances at Jun. 30, 2020	653,857	$ 2,437	3,605,982	(2,946,856)	(7,706)
Balances, in shares at Jun. 30, 2020		243,732
Balances at Mar. 31, 2020	660,644	$ 2,436	3,603,785	(2,945,647)	70
Balances, in shares at Mar. 31, 2020		243,586
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(1,209)			(1,209)
Other comprehensive income (loss)	(7,776)				(7,776)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		146
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	2,198	$ 1	2,197
Balances at Jun. 30, 2020	$ 653,857	$ 2,437	$ 3,605,982	$ (2,946,856)	$ (7,706)
Balances, in shares at Jun. 30, 2020		243,732