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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities |  |
Net loss | $ (148,014,000) | $ (67,236,000)
Adjustments to reconcile net loss to cash from operating activities |  |
Depreciation and amortization | 52,920,000 | 70,637,000
Equity-based compensation expense | 8,434,000 | 8,238,000
Goodwill impairment | 57,146,000 | 0
Loss on asset impairments and retirements | 20,532,000 | 4,268,000
Amortization of deferred financing costs | 291,000 | 274,000
Deferred tax provision (benefit) | (1,783,000) | 3,887,000
Provision for (recovery of) bad debts | 980,000 | (27,000)
(Gain) loss on disposal of assets | (898,000) | 984,000
Changes in fair value of investments | 218,000 | (1,935,000)
Unrealized gain on derivative instruments | 0 | (349,000)
Other | (380,000) | (566,000)
Changes in operating assets and liabilities |  |
Accounts receivable | 63,307,000 | 9,872,000
Inventories | (3,625,000) | (14,191,000)
Other current assets | 2,567,000 | 2,537,000
Other assets | 667,000 | 179,000
Accounts payable and accrued liabilities | (22,486,000) | (7,844,000)
Deferred revenue | (513,000) | 110,000
Other non-current liabilities | (4,048,000) | (353,000)
Net cash provided by operating activities | 25,315,000 | 8,485,000
Cash flows from investing activities |  |
Purchases of property, plant and equipment and intangibles | (25,722,000) | (26,979,000)
Proceeds from sale of assets | 7,037,000 | 353,000
Proceeds from sale of investments | 2,832,000 | 46,739,000
Purchase of investments | 0 | (20,304,000)
Other | (356,000) | 0
Net cash used in investing activities | (16,209,000) | (191,000)
Cash flows from financing activities |  |
Repayments of borrowings | 0 | (5,110,000)
Treasury shares withheld for taxes | (1,125,000) | (1,874,000)
Treasury share repurchase | (1,498,000) | 0
Proceeds from the issuance of ESPP shares | 934,000 | 1,752,000
Deferred financing costs | 0 | (184,000)
Net cash used in financing activities | (1,689,000) | (5,416,000)
Effect of exchange rate changes on cash | 3,267,000 | 2,684,000
Net increase in cash, cash equivalents and restricted cash | 10,684,000 | 5,562,000
Cash, cash equivalents and restricted cash at beginning of period | 196,740,000 | 186,212,000
Cash, cash equivalents and restricted cash at end of period | $ 207,424,000 | $ 191,774,000

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