Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)		$ (48,405,000)	$ (1,319,000)	$ 55,352,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent		(550,000)	12,244,000	(32,917,000)
Adjustments:
Amortization		128,473,000	146,549,000	116,528,000
Accretion		13,933,000	9,980,000	9,142,000
Deferred income taxes		(48,441,000)	(13,888,000)	(54,184,000)
Loss on debt extinguishments		0	9,342,000	21,365,000
Fair value adjustments, net		(3,638,000)	864,000	11,581,000
Stock-based compensation		8,328,000	10,541,000	9,715,000
Gain on sale of the Joaquin project		0	(21,138,000)	0
Asset Impairment Charges		55,297,000	0	4,446,000
Foreign exchange and other		7,353,000	(7,974,000)	356,000
Changes in operating assets and liabilities:
Receivables		(9,260,000)	18,895,000	(2,783,000)
Prepaid expenses and other current assets		4,876,000	(2,015,000)	(4,420,000)
Inventories		(44,488,000)	23,517,000	(34,610,000)
Accounts payable and accrued liabilities		(43,370,000)	11,562,000	(3,110,000)
CASH PROVIDED BY OPERATING ACTIVITIES		20,108,000	197,160,000	96,461,000
Cash provided by (used in) activities of discontinued operations		(2,690,000)	11,296,000	29,356,000
Net Cash Provided by (Used in) Operating Activities		17,418,000	208,456,000	125,817,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures		(140,787,000)	(136,734,000)	(94,382,000)
Payments to Acquire Businesses, Net of Cash Acquired		6,914,000	(156,248,000)	(1,417,000)
Proceeds from the sale of assets		577,000	16,705,000	16,296,000
Purchase of investments		(426,000)	(15,058,000)	(178,000)
Sales and maturities of short-term investments		12,713,000	11,321,000	7,077,000
Proceeds from Collection of Notes Receivable		19,000,000	0	0
Other		11,000	2,864,000	1,756,000
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(101,998,000)	(277,150,000)	(70,848,000)
Cash provided by (used in) activities of discontinued operations		(28,470,000)	(1,392,000)	(6,631,000)
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES		(130,468,000)	(278,542,000)	(77,479,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Common Stock		0	0	269,556,000
Issuance of notes and bank borrowings, net of issuance costs		95,000,000	342,620,000	0
Payments on long-term debt, capital leases, and associated costs		(95,059,000)	(203,045,000)	(318,153,000)
Gold production royalty payments		0	0	(27,155,000)
Other		(5,160,000)	(3,746,000)	172,000
Cash provided by (used in) activities of continuing operations		(5,219,000)	135,829,000	(75,580,000)
Cash provided by (used in) activities of discontinued operations		(22,000)	(84,000)	(4,648,000)
Cash provided by (used in) activities of discontinued operations		(5,241,000)	135,745,000	(80,228,000)
Effect of exchange rate changes on cash and cash equivalents		28,000	203,000	(678,000)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(118,263,000)	65,862,000	(32,568,000)
Less net cash provided by (used in) discontinued operations	[1]	(32,930,000)	(10,939,000)	1,576,000
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(85,333,000)	76,801,000	(34,144,000)
Cash, cash equivalents and restricted cash at beginning of period		203,402,000	126,601,000	160,745,000
Cash, cash equivalents and restricted cash at end of period		118,069,000	203,402,000	126,601,000
Net subsidiary payments to parent company		$ 1,748,000	$ 20,759	$ 16,501

[1] Less net cash provided by (used in) discontinued operations includes the following cash transactions: net subsidiary payments to parent company of $1,748, $20,759, and $16,501 during the years ended December 31, 2018, 2017, and 2016, respectively.