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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (9,424) $ (15,810)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 17,817 21,520
Impairments of fixed assets 0 650
Stock-based compensation expense 1,835 2,820
Amortization of debt discount and deferred financing costs 469 895
Deferred income tax benefit (174) (2,710)
Gains on extinguishment of 1.50% convertible senior notes 0 (3,637)
Gains on disposals of assets (543) (307)
Other, net 550 285
Changes in operating assets and liabilities:    
Accounts receivable (9,086) (10,701)
Inventories (13,090) (3,890)
Accounts payable and accrued liabilities (4,555) 1,648
Deferred revenue 4,324 (206)
Other operating assets and liabilities, net 1,142 1,026
Net cash flows used in operating activities (10,735) (8,417)
Cash flows from investing activities:    
Capital expenditures (2,858) (4,120)
Proceeds from disposition of property and equipment 869 1,851
Other, net (67) (95)
Net cash flows used in investing activities (2,056) (2,364)
Cash flows from financing activities:    
Revolving credit facility borrowings 367 12,220
Revolving credit facility repayments (367) (24,220)
Issuance of 4.75% convertible senior notes 0 135,000
Purchases of 1.50% convertible senior notes 0 (120,000)
Other debt and finance lease repayments, net (165) (145)
Payment of financing costs (68) (7,961)
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards (990) (1,500)
Net cash flows used in financing activities (1,223) (6,606)
Effect of exchange rate changes on cash and cash equivalents 320 (111)
Net change in cash and cash equivalents (13,694) (17,498)
Cash and cash equivalents, beginning of period 52,852 72,011
Cash and cash equivalents, end of period 39,158 54,513
Cash paid for:    
Interest 522 1,842
Income taxes, net $ 119 $ 577