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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net Income $ 425,922 $ 157,162 $ 101,218
Adjustments for:      
Depreciation, depletion, and amortization 227,959 109,258 85,644
Amortization of debt discount 948 938 1,611
Reclamation costs 4,821 3,815 3,729
Deferred income taxes (130,570) 20,659 10,643
Loss on redemption of convertible debt 0 0 3,044
Stock-based compensation 14,799 15,851 14,424
Equity pickup on investments in joint ventures 2,952 1,426 0
Unrealized loss (gain) on derivative instruments (5,093) 5,215 (2,238)
Change in fair value of marketable securities 10,741 (21,368) (34,630)
Non-cash fair value adjustment on acquired inventories 65,939 51,930 0
Loss (gain) on sale of mineral properties, plant and equipment (412) 2,804 863
Impairment of long-lived and other assets 20,275 0 0
Net change in operating assets and liabilities (29,295) (40,592) (66,169)
Net cash provided by (used in) operating activities 608,986 307,098 118,139
Investing activities      
Additions to mineral properties, plant and equipment (164,810) (138,990) (110,624)
Purchases of marketable securities (10,086) (29,550) (3,435)
Proceeds on Royalty Portfolio sale 32,600 0 0
Net proceeds from sales of marketable securities 11,396 97,098 3,308
Proceeds from sale of mineral properties, plant and equipment 2,505 8,537 1,214
Acquisition of non-controlling interest 0 0 (2,415)
Acquisition of Alacer, cash, cash equivalents and restricted cash 0 303,388 0
Other investing activities (742) (60) (2,929)
Net cash provided by (used in) investing activities (129,137) 240,423 (114,881)
Financing activities      
Repayment of debt, principal (70,000) (35,000) 0
Redemption of convertible notes 0 (114,994) (152,250)
Proceeds from issuance of convertible notes, net of transaction costs 0 0 222,932
Proceeds from issuance of debt 0 3,087 0
Proceeds from exercise of stock options 8,778 6,545 7,875
Purchase and cancellation of common shares (148,075) 0 0
Dividends paid (43,233) 0 0
Settlement of restricted and performance share units 408 (14,389) 60
Funding from non-controlling interest 0 0 3,710
Non-controlling interest dividend (55,464) 0 0
Principal payments on finance leases (10,441) (3,623) (554)
Other financing activities (1,742) 0 (304)
Net cash provided by (used in) financing activities (319,769) (158,374) 81,469
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash (3,136) 789 12
Net increase (decrease) in cash, cash equivalents, and restricted cash 156,944 389,936 84,739
Cash, cash equivalents, and restricted cash beginning of year 895,921 505,985 421,246
Cash, cash equivalents, and restricted cash end of year 1,052,865 895,921 505,985
Reconciliation of cash, cash equivalents, and restricted cash:      
Cash and cash equivalents 1,017,562 860,633 503,647
Restricted cash 35,303 35,288 2,338
Total cash, cash equivalents, and restricted cash $ 1,052,865 $ 895,921 $ 505,985