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	JDS Silver [Member] Accumulated Deficit	JDS Silver [Member] Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2015	$ 421,476	$ 1,513	$ 3,024,461	$ (2,600,776)	$ (3,722)
Balances, in shares at Dec. 31, 2015		151,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	55,352			55,352
Other comprehensive income (loss)	1,234				1,234
Stock Issued During Period, Shares, Extinguishment of Debt		739
Stock Issued During Period, Value, Extinguishment of Debt	11,813	$ 7	11,806	0	0
Stock Issued During Period, Shares, New Issues		26,944
Stock Issued During Period, Value, New Issues	269,556	$ 270	269,286	0	0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,911
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	9,056	$ 19	9,037
Balances at Dec. 31, 2016	768,487	$ 1,809	3,314,590	(2,545,424)	(2,488)
Balances, in shares at Dec. 31, 2016		180,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(1,319)			(1,319)
Other comprehensive income (loss)	5,007				5,007
Stock Issued During Period, Shares, Acquisitions							4,192
Stock Issued During Period, Value, Acquisitions						$ 36,007	$ 42	$ 35,965	$ 0	$ 0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		513
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	6,795	$ 5	6,790
Balances at Dec. 31, 2017	814,977	$ 1,856	3,357,345	(2,546,743)	2,519
Balances, in shares at Dec. 31, 2017		185,638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME (LOSS)	(48,405)			(48,405)
Other comprehensive income (loss)	26				26
Stock Issued During Period, Shares, Acquisitions							16,390
Stock Issued During Period, Value, Acquisitions						$ 82,668	$ 163	$ 82,505	$ 0	$ 0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,282
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	3,246	$ 14	3,232
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]
Reclassification of unrealized gain (loss) on equity securities for ASU 2016-01	$ 0			$ 2,604	$ (2,604)