Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)		$ (341,203)	$ (48,405)	$ (1,319)
(Income) Loss from Discontinued Operations, Net of Tax, Attributable to Parent		(5,693)	(550)	12,244
Adjustments:
Amortization		178,876	128,473	146,549
Accretion		12,147	13,933	9,980
Deferred income taxes		(36,817)	(48,441)	(13,888)
Gain (Loss) on Extinguishment of Debt		1,281	0	9,342
Fair value adjustments, net		(16,030)	(3,638)	864
Stock-based compensation		9,189	8,328	10,541
Gain (Loss) on Disposition of Assets		0	0	(21,138)
Impairment of Long-Lived Assets Held-for-use		250,814	0	0
Inventory Write-down		69,246	55,297	0
Deferred revenue recognition		(1,857)	0	0
Foreign exchange and other		14,281	7,353	(7,974)
Changes in operating assets and liabilities:
Receivables		(2,739)	(9,260)	18,895
Prepaid expenses and other current assets		280	4,876	(2,015)
Inventories		(62,998)	(44,488)	23,517
Accounts payable and accrued liabilities		23,103	(43,370)	11,562
CASH PROVIDED BY OPERATING ACTIVITIES		91,880	20,108	197,160
Cash provided by (used in) activities of discontinued operations		0	(2,690)	11,296
Cash provided by (used in) operating activities		91,880	17,418	208,456
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures		(99,772)	(140,787)	(136,734)
Payments to Acquire Businesses, Net of Cash Acquired		0	6,914	(156,248)
Proceeds from the sale of assets		1,033	577	16,705
Purchase of investments		(5,023)	(426)	(15,058)
Sales and maturities of short-term investments		2,109	12,713	11,321
Proceeds from Collection of Notes Receivable		7,168	19,000	0
Other		1,919	11	2,864
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(92,566)	(101,998)	(277,150)
Cash provided by (used in) activities of discontinued operations		0	(28,470)	(1,392)
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES		(92,566)	(130,468)	(278,542)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Common Stock		123,059	0	0
Issuance of notes and bank borrowings, net of issuance costs		60,000	95,000	342,620
Payments on long-term debt, capital leases, and associated costs		(221,854)	(95,059)	(203,045)
Gold production royalty payments		(18,697)	0	0
Other		(3,404)	(5,160)	(3,746)
Cash provided by (used in) activities of continuing operations		(60,896)	(5,219)	135,829
Cash provided by (used in) activities of discontinued operations		0	(22)	(84)
Cash provided by (used in) activities of discontinued operations		(60,896)	(5,241)	135,745
Effect of exchange rate changes on cash and cash equivalents		531	28	203
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(61,051)	(118,263)	65,862
Less net cash provided by (used in) discontinued operations	[1]	0	(32,930)	(10,939)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(61,051)	(85,333)	76,801
Cash, cash equivalents and restricted cash at beginning of period		118,069	203,402	126,601
Cash, cash equivalents and restricted cash at end of period		$ 57,018	118,069	203,402
Net subsidiary payments to parent company			$ 1,748	$ 20,759

[1] Less net cash used in discontinued operations includes the following cash transactions: net subsidiary payments to parent company of $1,748 and $20,759 during the years ended December 31, 2018 and 2017.