Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (20,396)	$ (33,287)
Adjustments:
Amortization	27,964	33,090
Accretion	3,169	3,150
Deferred income taxes	(2,105)	(2,184)
Fair value adjustments, net	8,695	4,884
Stock-based compensation	2,915	2,150
Impairment of equity securities	0	1,514
Write-downs	4,446	0
Foreign exchange and other	(1,435)	1,079
Changes in operating assets and liabilities:
Receivables	3,481	2,556
Prepaid expenses and other current assets	1,279	(1,327)
Inventories	(7,822)	684
Accounts payable and accrued liabilities	(13,574)	(15,758)
CASH PROVIDED BY OPERATING ACTIVITIES	6,617	(3,449)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(22,172)	(17,620)
Acquisitions, net of cash acquired	0	(102,018)
Other	2,536	(1,730)
Purchase of short term investments and equity securities	(7)	(278)
Sales and maturities of short-term investments	997	229
CASH USED IN INVESTING ACTIVITIES	(18,646)	(121,417)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of notes and bank borrowings	0	53,500
Payments on long-term debt, capital leases, and associated costs	(5,971)	(8,594)
Gold production royalty payments	9,131	10,368
Other	(280)	(423)
CASH PROVIDED BY FINANCING ACTIVITIES	(15,382)	34,115
Effect of exchange rate changes on cash and cash equivalents	86	(523)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(27,325)	(91,274)
Cash and cash equivalents at beginning of period	200,714	270,861
Cash and cash equivalents at end of period	$ 173,389	$ 179,587