Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 18,663	$ (20,396)
Adjustments:
Amortization	40,104	27,964
Accretion	2,514	3,169
Deferred income taxes	1,375	(2,105)
Fair value adjustments, net	1,200	8,695
Stock-based compensation	3,307	2,915
Gain on the sale of the Joaquin project	(21,138)	0
Write-downs	0	4,446
Foreign exchange and other	(2,198)	(1,435)
Changes in operating assets and liabilities:
Receivables	13,106	3,481
Prepaid expenses and other current assets	(4,299)	1,279
Inventories	14,292	(7,822)
Accounts payable and accrued liabilities	(11,655)	(13,574)
CASH PROVIDED BY OPERATING ACTIVITIES	55,271	6,617
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(23,979)	(22,172)
Proceeds from Sale of Property, Plant, and Equipment	15,019	4,009
Purchase of short term investments and equity securities	(1,016)	(7)
Sales and maturities of short-term investments	10,020	997
Other	(1,546)	(1,473)
CASH USED IN INVESTING ACTIVITIES	(1,502)	(18,646)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on long-term debt, capital leases, and associated costs	(3,226)	(5,971)
Gold production royalty payments	0	(9,131)
Other	(3,247)	(280)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(6,473)	(15,382)
Effect of exchange rate changes on cash and cash equivalents	555	86
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	47,851	(27,325)
Cash and cash equivalents at beginning of period	162,182	200,714
Cash and cash equivalents at end of period	$ 210,033	$ 173,389