Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ (1,209)	$ (36,764)	$ (13,109)	$ (55,965)
(Income) Loss from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	0	(5,693)
Adjustments:
Amortization	27,876	43,204	64,038	85,080
Accretion	2,908	3,007	5,755	5,950
Deferred income taxes	(1,545)	(9,158)	(7,032)	(17,417)
Gain (Loss) on Extinguishment of Debt	0
Fair value adjustments, net	(10,067)	5,296	(1,248)	(3,824)
Stock-based compensation	2,287	1,987	4,300	4,210
Gain on Modification of Lease	0	0	(4,051)	0
Inventory Write-down	5,208	11,872	15,589	27,319
Revenue Recognized	(8,134)	0	(15,682)	0
Foreign exchange and other	(913)	4,731	(2,005)	5,981
Changes in operating assets and liabilities:
Receivables	(1,536)	(7,624)	(2,349)	(17,359)
Prepaid expenses and other current assets	1,081	(834)	735	(3,518)
Inventories	(8,056)	(14,391)	(29,981)	(33,212)
Accounts payable and accrued liabilities	2,047	25,109	(13,004)	19,037
CASH PROVIDED BY OPERATING ACTIVITIES CONTINUING OPERATIONS	9,947	26,435	1,956	10,589
Cash provided by (used in) activities of discontinued operations	0	0	0	0
Cash provided by (used in) operating activities	9,947	26,435	1,956	10,589
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(16,682)	(20,749)	(38,890)	(48,187)
Proceeds from the sale of assets	9	57	4,515	904
Purchase of investments				0
Proceeds from Collection of Notes Receivable	0	2,000	0	7,168
Other	(183)	277	(200)	2,018
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	2,946	(17,313)	(14,773)	(36,995)
Cash provided by (used in) activities of discontinued operations	0	0	0	0
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	2,946	(17,313)	(14,773)	(36,995)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Common Stock	0	48,887	0	48,887
Issuance of notes and bank borrowings, net of issuance costs	100,000	0	150,000	15,000
Payments on long-term debt, capital leases, and associated costs	(95,713)	(90,812)	(101,614)	(113,273)
Gold production royalty payments	0	0	(18,750)	0
Other	141	0	(1,832)	(3,259)
Cash provided by (used in) activities of continuing operations	4,428	(41,925)	27,804	(52,645)
Cash provided by (used in) activities of discontinued operations	0	0	0	0
Cash provided by (used in) activities of discontinued operations	4,428	(41,925)	27,804	(52,645)
Effect of exchange rate changes on cash and cash equivalents	929	56	303	257
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	18,250	(32,747)	15,290	(78,794)
Less net cash provided by (used in) discontinued operations	0	0	0	0
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	18,250	(32,747)	15,290	(78,794)
Cash, cash equivalents and restricted cash at beginning of period	54,058	72,022	57,018	118,069
Cash, cash equivalents and restricted cash at end of period	72,308	39,275	72,308	39,275
Proceeds from Sale and Maturity of Marketable Securities	$ 19,802	$ 1,102	$ 19,802	$ 1,102