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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net loss | $ (63,993) | $ (468,383) | $ (231,808)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation and amortization expense | 80,741 | 98,543 | 123,319
Impairments of goodwill | 0 | 406,056 | 165,000
Impairments of inventories | 3,581 | 31,151 | 0
Impairments of fixed and lease assets | 4,166 | 12,447 | 33,697
Stock-based compensation expense | 7,879 | 8,431 | 16,768
Amortization of debt discount and deferred financing costs | 2,314 | 7,736 | 7,884
Deferred income tax benefit | (8,639) | (24,404) | (15,469)
Release of foreign currency translation adjustments on liquidation of an international operation | 9,320 | 0 | 0
Gains on extinguishment of 1.50% convertible senior notes | (4,022) | (10,721) | 0
Gains on disposals of assets | (6,472) | (2,444) | (4,291)
Other, net | (511) | 4,668 | 3,079
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (24,407) | 63,876 | 50,257
Inventories | (10,334) | 17,578 | (10,774)
Accounts payable and accrued liabilities | 17,727 | (37,315) | (6,173)
Deferred revenue | (148) | 25,549 | 3,470
Other operating assets and liabilities, net | (8) | (13) | 2,473
Net cash flows provided by operating activities | 7,194 | 132,755 | 137,432
Cash flows from investing activities: |  |  |
Capital expenditures | (17,517) | (12,749) | (56,116)
Proceeds from disposition of property and equipment | 11,527 | 9,601 | 6,046
Other, net | (636) | (581) | (1,912)
Net cash flows used in investing activities | (6,626) | (3,729) | (51,982)
Cash flows from financing activities: |  |  |
Revolving credit facility borrowings | 12,873 | 72,173 | 246,828
Revolving credit facility repayments | (31,873) | (105,104) | (331,041)
Issuance of 4.75% convertible senior notes | 135,000 | 0 | 0
Purchases of 1.50% convertible senior notes | (125,952) | (20,078) | (6,724)
Other debt and finance lease repayments, net | (230) | (8,222) | (500)
Payment of financing costs | (7,791) | (1,041) | (16)
Purchases of treasury stock | 0 | 0 | (757)
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards | (1,595) | (2,745) | (3,698)
Net cash flows used in financing activities | (19,568) | (65,017) | (95,908)
Effect of exchange rate changes on cash and cash equivalents | (159) | (491) | (365)
Net change in cash and cash equivalents | (19,159) | 63,518 | (10,823)
Cash and cash equivalents, beginning of period | 72,011 | 8,493 | 19,316
Cash and cash equivalents, end of period | 52,852 | 72,011 | 8,493
Cash paid (received) for: |  |  |
Interest | 6,532 | 6,402 | 9,626
Income taxes, net | $ 152 | $ (36,766) | $ (1,303)

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