Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 55,352	$ (367,183)	$ (1,186,874)
Adjustments:
Amortization	123,161	143,751	162,436
Accretion	10,248	14,149	16,246
Deferred income taxes	(71,350)	(40,838)	(448,905)
Loss on termination of revolving credit facility	0	0	3,035
(Gain) Loss on extinguishment of debt	21,365	(15,916)	0
Fair value adjustments, net	11,581	(5,202)	(3,618)
Stock-based compensation	9,715	9,272	9,288
Gain (Loss) on Disposition of Assets	(11,334)	352	530
Impairment of equity securities	703	2,346	6,593
Write-downs	4,446	313,337	1,472,721
Foreign exchange and other	(1,067)	16,303	124
Changes in operating assets and liabilities:
Receivables	9,011	17,560	(11,611)
Prepaid expenses and other current assets	(826)	(3,063)	5,635
Inventories	(35,591)	19,573	12,971
Accounts payable and accrued liabilities	(10,931)	9,453	15,507
CASH PROVIDED BY OPERATING ACTIVITIES	125,817	113,542	53,548
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(101,013)	(95,193)	(64,244)
Acquisitions, net of cash acquired	(1,417)	(110,846)	(21,329)
Proceeds from Sale of Property, Plant, and Equipment	16,296	607	329
Purchase of short term investments and equity securities	(178)	(1,880)	(50,513)
Sales and maturities of short-term investments	7,077	605	54,344
Other	(4,208)	(4,586)	(321)
CASH USED IN INVESTING ACTIVITIES	(83,443)	(211,293)	(81,734)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Common Stock	269,556	0	0
Proceeds from Issuance of Unsecured Debt	0	153,500	167,784
Payments on long-term debt, capital leases, and associated costs	(322,801)	(84,715)	(25,902)
Gold production royalty payments	27,155	39,235	48,395
Other	172	(542)	(509)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(80,228)	29,008	92,978
Effect of exchange rate changes on cash and cash equivalents	(678)	(1,404)	(621)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(38,532)	(70,147)	64,171
Cash and cash equivalents at beginning of period	200,714	270,861	206,690
Cash and cash equivalents at end of period	$ 162,182	$ 200,714	$ 270,861