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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 (loss) | $ 35,095 | $ (9,457) | $ (94,909)
Non-cash elements included in net income (loss): |  |  |
Depreciation, depletion and amortization | 172,651 | 155,006 | 196,408
Fair value adjustments, net | 15,040 | (4,690) | 7,079
Adjustment of inventory to net realizable value | 6,524 | 0 | 1,399
Fee on prepayment of debt with shares of common stock | 0 | 0 | 2,855
Loss on disposition of properties, plants, equipment and mineral interests | 87 | 572 | 4,643
Provision for reclamation and closure costs | 11,514 | 6,189 | 6,914
Deferred income taxes | (48,049) | (3,818) | (29,968)
Stock compensation | 6,082 | 6,458 | 5,668
Amortization of loan origination fees | 1,895 | 3,666 | 2,637
Foreign exchange (gain) loss | (79) | 2,680 | 8,025
Other non-cash items | 681 | 1,794 | 42
Changes in assets and liabilities: |  |  |
Accounts receivable | (5,405) | (1,080) | (10,939)
Inventories | 16,919 | (13,208) | 16,146
Other current and non-current assets | (1,678) | 2,381 | 15,618
Accounts payable and accrued liabilities | (795) | 19,379 | (24,355)
Accrued payroll and related benefits | 1,270 | 14,445 | 9,226
Accrued taxes | 6,457 | 3,561 | (3,155)
Accrued reclamation and closure costs and other non-current liabilities | 2,128 | (3,085) | 7,532
Net cash provided by operating activities | 220,337 | 180,793 | 120,866
Investing activities: |  |  |
Additions to properties, plants, equipment and mineral interests | (109,048) | (91,016) | (121,421)
Purchase of carbon credits | (869) | 0 | 0
Proceeds from sale or exchange of investments | 1,811 | 0 | 1,760
Proceeds from disposition of properties, plants, equipment and mineral interests | 1,077 | 331 | 183
Purchases of investments | 0 | (2,216) | (389)
Net cash used in investing activities | 107,029 | 92,901 | 119,867
Financing activities: |  |  |
Proceeds from issuance of common stock, net of offering costs | 0 | 0 | 49,019
Dividends paid to common and preferred stockholders | (20,672) | (9,152) | (5,466)
Debt issuance and credit facility fees paid | (116) | (1,356) | (976)
Acquisition of treasury shares from employee equity awards | (4,525) | (2,745) | (2,231)
Borrowings of debt | 0 | 716,327 | 279,500
Repayments of debt | 0 | (716,500) | (279,500)
Repayments of finance leases | (7,285) | (5,953) | (7,157)
Net cash (used in) provided by financing activities | (32,598) | (19,379) | 33,189
Effect of exchange rates on cash | (530) | (1,107) | 875
Net increase in cash, cash equivalents and restricted cash and cash equivalents | 80,180 | 67,406 | 35,063
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year | 130,883 | 63,477 | 28,414
Cash, cash equivalents and restricted cash and cash equivalents at end of year | 211,063 | 130,883 | 63,477
Supplemental disclosure of cash flow information: |  |  |
Interest | (37,565) | (34,853) | (42,972)
Income and mining taxes | (12,105) | 7,913 | (3,385)
Significant non-cash investing and financing activities: |  |  |
Adjustment to common stock and warrants issued for acquisition of another company | 0 | 0 | (325)
Addition of finance lease obligations | 4,870 | 9,113 | 6,506
Recognition of operating lease liabilities and right-of-use assets | 4,874 | 0 | 22,365
Common stock contributed to pension plans | 22,250 | 16,032 | 3,600
Common stock issued for 401(k) match | 4,339 | 4,624 | 3,862
Payment of accrued compensation in restricted stock units | 0 | 5,096 | 8,274
Common Stocks issued for prepayment of debt | 0 | 0 | 33,457
Equity securities received from exchange of investments | 3,626 | 0 | 0
Marketable equity securities received for sale of mineral interest | $ 0 | $ 0 | $ 2,257

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