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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities |  |
Net loss | $ (67,236) | $ (74,835)
Adjustments to reconcile net loss to cash from operating activities |  |
Depreciation and amortization | 70,637 | 84,160
Equity-based compensation expense | 8,238 | 8,176
Amortization of deferred financing costs | 274 | 0
Deferred tax provision | 3,887 | 0
Provision for (recovery of) bad debts | (27) | 68
(Gain) loss on disposal of assets | 984 | (1,790)
Changes in fair value of investments | (1,935) | (1,295)
Unrealized gain on derivative instruments | (349) | (442)
Loss on asset impairments | 4,268 | 0
Other | (566) | 0
Changes in operating assets and liabilities |  |
Accounts receivable | 9,872 | (37,252)
Inventories | (14,191) | (3,470)
Other current assets | 2,537 | 2,237
Other assets | 179 | 204
Accounts payable and accrued liabilities | (7,844) | (10,249)
Deferred revenue | 110 | (346)
Other non-current liabilities | (353) | (560)
Net cash provided by (used in) operating activities | 8,485 | (35,394)
Cash flows from investing activities |  |
Purchases of property, plant and equipment and intangibles | (26,979) | (14,557)
Proceeds from sale of assets | 353 | 4,419
Proceeds from sale of investments | 46,739 | 67,934
Purchase of investments | (20,304) | (67,011)
Net cash used in investing activities | (191) | (9,215)
Cash flows from financing activities |  |
Repayments of borrowings | (5,110) | (4,289)
Treasury shares withheld for taxes | (1,874) | (1,501)
Proceeds from the issuance of ESPP shares | 1,752 | 1,315
Deferred financing costs | (184) | (161)
Net cash used in financing activities | (5,416) | (4,636)
Effect of exchange rate changes on cash | 2,684 | 2,357
Net increase (decrease) in cash, cash equivalents and restricted cash | 5,562 | (46,888)
Cash, cash equivalents and restricted cash at beginning of period | 186,212 | 213,015
Cash, cash equivalents and restricted cash at end of period | $ 191,774 | $ 166,127

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for 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 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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