Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 25,627	$ (341,203)	$ (48,405)
(Income) Loss from Discontinued Operations, Net of Tax, Attributable to Parent	0	(5,693)	(550)
Adjustments:
Amortization	131,387	178,876	128,473
Accretion	11,984	12,147	13,933
Deferred income taxes	(7,283)	(36,817)	(48,441)
Loss on debt extinguishment	0	1,281	0
Fair value adjustments, net	(7,634)	(16,030)	(3,638)
Stock-based compensation	8,548	9,189	8,328
Gain on Modification of Lease	(4,051)	0	0
Impairment of Long-Lived Assets Held-for-use	0	250,814	0
Inventory Write-down	16,821	69,246	55,297
Revenue Recognized	(16,702)	(1,857)	0
Foreign exchange and other	3,737	14,281	7,353
Changes in operating assets and liabilities:
Receivables	(9,463)	(2,739)	(9,260)
Prepaid expenses and other current assets	(2,621)	280	4,876
Inventories	(34,538)	(62,998)	(44,488)
Accounts payable and accrued liabilities	32,897	23,103	(43,370)
CASH PROVIDED BY OPERATING ACTIVITIES CONTINUING OPERATIONS	148,709	91,880	20,108
Cash provided by (used in) activities of discontinued operations	0	0	(2,690)
Cash provided by (used in) operating activities	148,709	91,880	17,418
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(99,279)	(99,772)	(140,787)
Payments to Acquire Businesses, Net of Cash Acquired	0	0	(6,914)
Proceeds from the sale of assets	5,529	1,033	577
Purchase of investments	(2,500)	(5,023)	(426)
Sale of investments	30,831	2,109	12,713
Proceeds from notes receivable	0	7,168	19,000
Other	(252)	1,919	11
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(65,671)	(92,566)	(101,998)
Cash provided by (used in) activities of discontinued operations	0	0	(28,470)
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(65,671)	(92,566)	(130,468)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Common Stock	0	123,059	0
Issuance of notes and bank borrowings, net of issuance costs	150,000	60,000	95,000
Payments on long-term debt, capital leases, and associated costs	(175,984)	(221,854)	(95,059)
Gold production royalty payments	(18,750)	(18,697)	0
Other	(1,801)	(3,404)	(5,160)
Cash provided by (used in) activities of continuing operations	(46,535)	(60,896)	(5,219)
Cash provided by (used in) activities of discontinued operations	0	0	(22)
Cash provided by (used in) activities of discontinued operations	(46,535)	(60,896)	(5,241)
Effect of exchange rate changes on cash and cash equivalents	649	531	28
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	37,152	(61,051)	(118,263)
Less net cash provided by (used in) discontinued operations	0	0	(32,930)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	37,152	(61,051)	(85,333)
Cash, cash equivalents and restricted cash at beginning of period	57,018	118,069	203,402
Cash, cash equivalents and restricted cash at end of period	$ 94,170	$ 57,018	118,069
Net subsidiary payments to parent company			$ 1,748