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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 58 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Operating activities: |  |  |  |  |
Net loss |  | $ (16,790) | $ (99,557) | $ (26,563) |
Non-cash elements included in net loss: |  |  |  |  |
Depreciation, depletion and amortization |  | 164,026 | 204,475 | 140,905 |
(Gain) loss on disposition of investments |  | 0 | (923) | 34 |
Unrealized (gain) loss on investments |  | (10,268) | 2,389 | 2,816 |
Adjustment of inventory to market value |  | 0 | 1,399 | 8,191 |
Fee on prepayment of debt with shares of common stock |  | 0 | 2,855 | 0 |
Loss (gain) on disposition of properties, plants, equipment and mineral interests |  | 572 | 4,643 | (2,793) |
Provision for reclamation and closure costs |  | 6,189 | 6,914 | 6,090 |
Deferred income taxes |  | (5,505) | (33,387) | (9,699) |
Stock compensation |  | 6,458 | 5,668 | 6,278 |
Amortization of loan origination fees |  | 3,666 | 2,637 | 2,077 |
Loss (gain) on derivative contracts |  | 5,578 | 5,613 | (15,366) |
Foreign exchange loss (gain) |  | 2,680 | 8,025 | (7,104) |
Foundation grant |  | 1,970 | 0 | 0 |
Other non-cash items |  | (176) | 42 | (66) |
Change in assets and liabilities, net of business acquired: |  |  |  |  |
Accounts receivable |  | (1,080) | (10,939) | 9,843 |
Inventories |  | (13,208) | 16,146 | (27,512) |
Other current and non-current assets |  | 2,381 | 15,618 | (1,726) |
Accounts payable and accrued liabilities |  | 19,379 | (24,355) | 17,795 |
Accrued payroll and related benefits |  | 14,445 | 9,226 | (2,425) |
Accrued taxes |  | 3,561 | (3,155) | 645 |
Accrued reclamation and closure costs and other non-current liabilities |  | (3,085) | 7,532 | (7,199) |
Net cash provided by operating activities |  | 180,793 | 120,866 | 94,221 |
Investing activities: |  |  |  |  |
Additions to properties, plants, equipment and mineral interests |  | (91,016) | (121,421) | (136,933) |
Proceeds from sale of investments |  | 0 | 1,760 | 0 |
Proceeds from disposition of properties, plants and equipment |  | 331 | 183 | 2,411 |
Insurance proceeds received for damaged property |  | 0 | 0 | 4,377 |
Purchases of investments |  | (2,216) | (389) | (31,971) |
Maturities of investments |  | 0 | 0 | 64,895 |
Purchase of other companies, net of cash and restricted cash acquired |  | 0 | 0 | (139,326) |
Net cash used in investing activities |  | 92,901 | 119,867 | 236,547 |
Financing activities: |  |  |  |  |
Proceeds from issuance of common stock, net of offering costs | $ 49,000 | 0 | 49,019 | 6,744 | $ 73,500
Dividends paid to common stockholders |  | (8,600) | (4,914) | (4,393) |
Dividend paid to preferred stockholders |  | (552) | (552) | (552) |
Debt issuance and credit facility fees paid |  | (1,356) | (976) | (2,638) |
Acquisition of treasury shares from employee equity awards |  | (2,745) | (2,231) | (2,694) |
Borrowings on debt |  | 716,327 | 279,500 | 102,024 |
Repayments of debt |  | (716,500) | (279,500) | (106,036) |
Repayments of finance leases |  | (5,953) | (7,157) | (7,339) |
Net cash (used in) provided by financing activities |  | (19,379) | 33,189 | (14,884) |
Effect of exchange rates on cash |  | (1,107) | 875 | (1,515) |
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents |  | 67,406 | 35,063 | (158,725) |
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year |  | 63,477 | 28,414 | 187,139 |
Cash, cash equivalents and restricted cash and cash equivalents at end of year | $ 63,477 | 130,883 | 63,477 | 28,414 | $ 130,883
Supplemental disclosure of cash flow information: |  |  |  |  |
Interest |  | (34,853) | (42,972) | (38,400) |
Income taxes |  | 7,913 | (3,385) | 115 |
Significant non-cash investing and financing activities: |  |  |  |  |
Common stock and warrants issued for acquisition of other companies |  | 0 | (325) | 252,544 |
Addition of finance lease obligations |  | 9,113 | 6,506 | 7,008 |
Recognition of operating lease liabilities and right-of-use assets |  | 0 | 22,365 | 0 |
Common stock contributed to pension plans |  | 16,032 | 3,600 | 7,595 |
Common stock issued for 401(k) match |  | 4,624 | 3,862 | 3,705 |
Payment of accrued compensation in restricted stock units |  | 5,096 | 8,274 | 4,863 |
Common stock issued for prepayment of debt |  | 0 | 33,457 | 0 |
Marketable equity securities received for sale of mineral interest |  | $ 0 | $ 2,257 | $ 0 |

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