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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ (12,425) $ (44,123)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization expense 51,469 62,086
Settlement of disputes with seller of GEODynamics, Inc. 620 0
Impairments of inventories 0 2,113
Impairments of fixed and lease assets 0 3,444
Stock-based compensation expense 5,167 6,251
Amortization of debt discount and deferred financing costs 1,416 1,839
Deferred income tax provision (benefit) 1,295 (10,340)
Gains on extinguishment of 1.50% convertible senior notes (157) (4,022)
Gains on disposals of assets (1,538) (3,558)
Other, net 616 325
Changes in operating assets and liabilities, net of effect from acquired business:    
Accounts receivable (27,745) 1,112
Inventories (18,680) (10,767)
Accounts payable and accrued liabilities 8,873 13,708
Deferred revenue 7,496 (872)
Other operating assets and liabilities, net 2,586 3,376
Net cash flows provided by operating activities 18,993 20,572
Cash flows from investing activities:    
Capital expenditures (13,263) (10,977)
Proceeds from disposition of property and equipment 2,211 6,160
Acquisition of business, net of cash acquired (8,125) 0
Other, net (168) (511)
Net cash flows used in investing activities (19,345) (5,328)
Cash flows from financing activities:    
Revolving credit facility borrowings 9,830 12,782
Revolving credit facility repayments (9,830) (31,782)
Payment of promissory note to seller of GEODynamics, Inc. (10,000) 0
Issuance of 4.75% convertible senior notes 0 135,000
Purchases of 1.50% convertible senior notes (6,272) (125,952)
Other debt and finance lease repayments, net (541) (55)
Payment of financing costs (81) (7,785)
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards (1,002) (1,595)
Net cash flows used in financing activities (17,896) (19,387)
Effect of exchange rate changes on cash and cash equivalents (1,501) (307)
Net change in cash and cash equivalents (19,749) (4,450)
Cash and cash equivalents, beginning of period 52,852 72,011
Cash and cash equivalents, end of period 33,103 67,561
Cash paid (received) for:    
Interest 4,605 2,785
Income taxes, net $ (67) $ 1,272