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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities |  |
Net loss | $ (28,287) | $ (42,073)
Adjustments to reconcile net loss to cash from operating activities |  |
Depreciation and amortization | 25,242 | 28,300
Equity-based compensation expense | 2,574 | 2,280
Amortization of deferred financing costs | 87 | 0
Deferred tax provision | 3,618 | 0
Provision for bad debts | 19 | 103
Loss on disposal of assets | 227 | 235
Changes in fair value of investments | (1,412) | 191
Unrealized gain on derivative instruments | (496) | (561)
Other | (500) | 0
Changes in operating assets and liabilities |  |
Accounts receivable | (14,734) | (4,426)
Inventories | (4,083) | (2,469)
Other current assets | 771 | 1,042
Other assets | (245) | 270
Accounts payable and accrued liabilities | (13,184) | (3,295)
Deferred revenue | 22 | (410)
Other non-current liabilities | 611 | (96)
Net cash used in operating activities | (29,770) | (20,909)
Cash flows from investing activities |  |
Purchases of property, plant and equipment and intangibles | (8,145) | (6,323)
Proceeds from sale of assets | 14 | 1,639
Proceeds from sale of investments | 12,539 | 30,969
Purchase of investments | (5,195) | (26,428)
Net cash used in investing activities | (787) | (143)
Cash flows from financing activities |  |
Repayments of borrowings | (1,737) | (1,455)
Treasury shares withheld for taxes | (1,452) | (1,035)
Proceeds from the issuance of ESPP shares | 692 | 561
Net cash used in financing activities | (2,497) | (1,929)
Effect of exchange rate changes on cash | (376) | (1,255)
Net decrease in cash and cash equivalents | (33,430) | (24,236)
Cash and cash equivalents at beginning of period | 186,212 | 213,015
Cash and cash equivalents at end of period | $ 152,782 | $ 188,779

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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=109223946&loc=d3e3602-108585 + 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 investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and 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=109223946&loc=d3e3602-108585 + Details
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