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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (44,123) $ (449,636)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization expense 62,086 75,306
Impairments of goodwill 0 406,056
Impairments of inventories 2,113 31,151
Impairments of fixed and lease assets 3,444 8,190
Stock-based compensation expense 6,251 5,346
Amortization of debt discount and deferred financing costs 1,839 5,937
Deferred income tax benefit (10,340) (16,915)
Gains on extinguishment of 1.50% convertible senior notes (4,022) (10,721)
Gains on disposals of assets (3,558) (2,088)
Other, net 325 3,732
Changes in operating assets and liabilities:    
Accounts receivable 1,112 67,371
Inventories (10,767) 9,174
Accounts payable and accrued liabilities 13,708 (39,594)
Deferred revenue (872) 31,114
Other operating assets and liabilities, net 3,376 6,719
Net cash flows provided by operating activities 20,572 131,142
Cash flows from investing activities:    
Capital expenditures (10,977) (11,277)
Proceeds from disposition of property and equipment 6,160 8,984
Other, net (511) (444)
Net cash flows used in investing activities (5,328) (2,737)
Cash flows from financing activities:    
Revolving credit facility borrowings 12,782 72,173
Revolving credit facility repayments (31,782) (105,104)
Issuance of 4.75% convertible senior notes 135,000 0
Purchases of 1.50% convertible senior notes (125,952) (20,078)
Other debt and finance lease repayments, net (55) (337)
Payment of financing costs (7,785) (962)
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards (1,595) (2,675)
Net cash flows used in financing activities (19,387) (56,983)
Effect of exchange rate changes on cash and cash equivalents (307) (214)
Net change in cash and cash equivalents (4,450) 71,208
Cash and cash equivalents, beginning of period 72,011 8,493
Cash and cash equivalents, end of period 67,561 79,701
Cash paid (received) for:    
Interest 2,785 5,716
Income taxes, net $ 1,272 $ (37,393)