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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES    
Net income for the year $ 243,887 $ 158,824
Add (deduct) items not affecting cash:    
Amortization of property, plant and mine development (note 10) 508,739 613,160
Deferred income and mining taxes (note 23) 10,855 7,609
Gain on sale of available-for-sale securities (note 8) (168) (3,500)
Stock-based compensation (note 18) 43,674 33,804
Impairment loss on available-for-sale securities (note 8) 8,532  
Gain on impairment reversal (note 22)   (120,161)
Foreign currency translation loss 13,313 13,157
Other 15,362 14,012
Adjustment for settlement of reclamation provision (4,824) (2,719)
Changes in non-cash working capital balances:    
Trade receivables (3,815) (471)
Income taxes (31,913) 28,082
Inventories (64,889) 20,355
Other current assets (13,722) 53,009
Accounts payable and accrued liabilities 44,694 (35,408)
Interest payable (2,168) (1,136)
Cash provided by operating activities 767,557 778,617
INVESTING ACTIVITIES    
Additions to property, plant and mine development (note 10) (874,153) (516,050)
Acquisitions, net of cash and cash equivalents acquired (note 5) (71,989) (12,434)
Net purchases of short- term investments (2,495) (980)
Net proceeds from sale of available-for-sale securities and other investments (note 8) 333 9,461
Purchases of available- for- sale securities and other investments (note 8) (51,724) (33,774)
(Increase) decrease in restricted cash (24) 287
Cash used in investing activities (1,000,052) (553,490)
FINANCING ACTIVITIES    
Dividends paid (76,075) (71,375)
Repayment of finance lease obligations (note 13(a)) (5,252) (10,004)
Proceeds from long- term debt (note 14) 280,000 125,000
Repayment of long- term debt (note 14) (410,412) (405,374)
Notes issuance (note 14) 300,000 350,000
Long- term debt financing (note 14) (3,505) (3,415)
Repurchase of common shares for stock-based compensation plans (notes 16 and 18(c,d)) (24,684) (15,576)
Proceeds on exercise of stock options (note 18(a)) 44,199 192,103
Common shares issued (note 16) 224,896 29,027
Cash provided by financing activities 329,167 190,386
Effect of exchange rate changes on cash and cash equivalents (3,668) 311
Net increase in cash and cash equivalents during the year 93,004 415,824
Cash and cash equivalents, beginning of year 539,974 124,150
Cash and cash equivalents, end of year 632,978 539,974
SUPPLEMENTAL CASH FLOW INFORMATION    
Interest paid (note 14) 78,885 71,401
Income and mining taxes paid $ 127,915 $ 105,184