Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)		$ (53,044)	$ (16,652)	$ (48,873)	$ (8,944)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent		0	4,924	(550)	5,520
Adjustments:
Amortization		31,184	32,400	91,420	101,827
Accretion		3,117	2,402	10,321	6,954
Deferred income taxes		(3,276)	2,504	(4,087)	1,452
Loss on debt extinguishments		0	0	0	9,342
Fair value adjustments, net		(715)	0	(2,907)	864
Stock-based compensation		1,942	2,585	6,578	8,127
Gain on sale of the Joaquin project		0	0	0	(21,138)
Asset Impairment Charges		30,787	0	30,787	0
Foreign exchange and other		2,938	(3,013)	5,180	(8,330)
Changes in operating assets and liabilities:
Receivables		(5,930)	6,289	(16,509)	9,754
Prepaid expenses and other current assets		1,377	(1,332)	3,868	(2,177)
Inventories		(8,156)	(2,282)	(19,630)	8,080
Accounts payable and accrued liabilities		5,565	9,484	(35,562)	(5,982)
CASH PROVIDED BY OPERATING ACTIVITIES		5,789	37,309	20,036	105,349
Cash provided by (used in) activities of discontinued operations		0	(7,877)	(2,690)	8,633
Net Cash Provided by (Used in) Operating Activities		5,789	29,432	17,346	113,982
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures		(39,472)	(28,982)	(122,982)	(89,680)
Proceeds from the sale of assets		393	1,016	549	16,471
Purchase of investments		(15)	(3,595)	(415)	(13,559)
Sales and maturities of short-term investments		(78)	403	12,682	11,321
Proceeds from Collection of Notes Receivable		15,000	0	15,000	0
Other		64	(4,319)	(34)	(4,385)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(24,108)	(35,477)	(95,200)	(79,832)
Cash provided by (used in) activities of discontinued operations		0	(412)	(28,470)	(1,175)
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES		(24,108)	(35,889)	(123,670)	(81,007)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of notes and bank borrowings, net of issuance costs		25,000	(2,257)	40,000	242,701
Payments on long-term debt, capital leases, and associated costs		(25,533)	(3,323)	(48,355)	(195,439)
Other		(77)	(6)	(4,916)	(3,726)
Cash provided by (used in) activities of continuing operations		(610)	(5,586)	(13,271)	43,536
Cash provided by (used in) activities of discontinued operations		0	(21)	(22)	(62)
Cash provided by (used in) activities of discontinued operations		(610)	(5,607)	(13,293)	43,474
Effect of exchange rate changes on cash and cash equivalents		183	(222)	565	662
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(18,746)	(12,286)	(119,052)	77,111
Less net cash provided by (used in) discontinued operations	[1]	0	(8,491)	(32,930)	(3,302)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(18,746)	(3,795)	(86,122)	80,413
Cash, cash equivalents and restricted cash at beginning of period		136,026	210,809	203,402	126,601
Cash, cash equivalents and restricted cash at end of period		117,280	207,014	117,280	207,014
Net subsidiary payments to parent company		$ 0	$ 181	$ 1,748	$ 10,698

[1] Less net cash provided by (used in) discontinued operations includes the following cash transactions: net subsidiary payments to parent company of $181 for the three months ended September 30, 2017 and $1,748 and $10,698 during the nine months ended September 30, 2018 and 2017, respectively.