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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities: |  |  |  |  |  |  |  |
Net (loss) income | $ (23,184) | $ 314 | $ 25,082 | $ 134 | $ (2,870) | $ 447 | $ (28,520) | $ 61,569
Non-cash elements included in net (loss) income: |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  | 31,073 | 59,855 | 108,814 | 91,255 | 126,467 | 124,918
Loss on disposition of investments |  |  |  |  |  | 167 |  |
Unrealized loss on investments | 2,207 | 124 |  |  | 2,461 | 73 |  |
Adjustment of inventory to market value |  |  |  |  | 7,232 |  |  |
Gain on disposition of properties, plants, equipment, and mineral interests |  |  |  |  | (3,374) | (4,924) |  |
Provision for reclamation and closure costs |  |  |  |  | 3,957 | 3,379 |  |
Stock compensation |  |  |  |  | 4,672 | 4,943 |  |
Deferred income taxes |  |  | (20,963) | (21,571) | (4,637) | (23,467) | 19,392 | 2,774
Amortization of loan origination fees |  |  |  |  | 1,471 | 1,415 |  |
Loss on derivative contracts |  |  |  |  | (15,208) | 16,718 |  |
Foreign exchange (gain) loss |  |  | 504 | 4,396 | (2,032) | 10,520 | 10,208 | 4,460
Other non-cash items, net |  |  |  |  | (37) | (1) |  |
Change in assets and liabilities, net of business acquisitions: |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | (4,424) | 4,903 |  |
Inventories |  |  |  |  | (18,954) | (9,611) |  |
Other current and non-current assets |  |  |  |  | (5,569) | (2,685) |  |
Accounts payable and accrued liabilities |  |  |  |  | 12,308 | (7,759) |  |
Accrued payroll and related benefits |  |  |  |  | (4,207) | (913) |  |
Accrued taxes |  |  |  |  | 845 | (4,469) |  |
Accrued reclamation and closure costs and other non-current liabilities |  |  |  |  | (5,238) | (5,876) |  |
Cash provided by operating activities |  |  | 38,285 | 45,821 | 75,210 | 74,115 | 115,878 | 225,328
Investing activities: |  |  |  |  |  |  |  |
Additions to properties, plants, equipment and mineral interests |  |  |  |  | (83,285) | (70,390) |  |
Acquisition of Klondex, net of cash and restricted cash acquired |  |  |  |  | (139,326) |  |  |
Proceeds from disposition of properties, plants, equipment and mineral interests |  |  |  |  | 722 | 151 |  |
Insurance proceeds received for damaged property |  |  |  |  | 4,377 | 5,628 |  |
Purchases of investments |  |  |  |  | (31,971) | (36,916) |  |
Maturities of investments |  |  |  |  | 64,895 | 31,169 |  |
Net cash used in investing activities |  |  |  |  | (184,588) | (70,358) |  |
Financing activities: |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs |  |  |  |  | 3,085 | 9,610 |  |
Acquisition of treasury shares |  |  |  |  | (2,694) | (2,993) |  |
Dividends paid to common shareholders |  |  |  |  | (3,193) | (2,978) |  |
Dividends paid to preferred shareholders |  |  |  |  | (414) | (414) |  |
Credit availability and debt issuance fees |  |  |  |  | (2,460) | (476) |  |
Borrowings on debt |  |  |  |  | 78,024 |  |  |
Repayments of debt |  |  |  |  | (82,036) | (470) |  |
Repayments of capital leases |  |  |  |  | (5,992) | (5,065) |  |
Net cash used in financing activities |  |  |  |  | (15,680) | (2,786) |  |
Effect of exchange rates on cash |  |  |  |  | (215) | 1,051 |  |
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents |  |  |  |  | (125,273) | 2,022 |  |
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period |  |  | $ 171,977 | $ 171,977 | 187,139 | 171,977 | 171,977 |
Cash, cash equivalents and restricted cash and cash equivalents at end of period | $ 61,866 | $ 173,999 |  |  | 61,866 | 173,999 | $ 187,139 | $ 171,977
Significant non-cash investing and financing activities: |  |  |  |  |  |  |  |
Addition of capital lease obligations |  |  |  |  | 7,008 | 6,439 |  |
Common stock issued for the acquisition of other companies |  |  |  |  | 252,544 |  |  |
Payment of accrued compensation in restricted stock units |  |  |  |  | $ 4,863 | $ 4,240 |  |

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- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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