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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (14,568) $ (31,081)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 35,056 42,429
Settlement of disputes with seller of GEODynamics, Inc. 620 0
Impairments of fixed and lease assets 0 3,444
Stock-based compensation expense 3,504 4,703
Amortization of debt discount and deferred financing costs 944 1,366
Deferred income tax provision (benefit) 2,584 (6,834)
Gains on extinguishment of 1.50% convertible senior notes (157) (4,022)
Gains on disposals of assets (1,185) (1,632)
Other, net 517 375
Changes in operating assets and liabilities, net of effect from acquired business:    
Accounts receivable (20,469) (6,962)
Inventories (14,664) (4,458)
Accounts payable and accrued liabilities (5,994) 11,896
Deferred revenue 4,647 1,780
Other operating assets and liabilities, net (870) 2,929
Net cash flows provided by (used in) operating activities (10,035) 13,933
Cash flows from investing activities:    
Capital expenditures (6,453) (7,311)
Proceeds from disposition of property and equipment 1,652 3,422
Acquisition of business, net of cash acquired (8,125) 0
Other, net (85) (326)
Net cash flows used in investing activities (13,011) (4,215)
Cash flows from financing activities:    
Revolving credit facility borrowings 9,725 12,571
Revolving credit facility repayments (9,725) (31,571)
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 activity, net (359) 119
Payment of financing costs (74) (7,779)
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards (1,002) (1,500)
Net cash flows used in financing activities (7,707) (19,112)
Effect of exchange rate changes on cash and cash equivalents 147 33
Net change in cash and cash equivalents (30,606) (9,361)
Cash and cash equivalents, beginning of period 52,852 72,011
Cash and cash equivalents, end of period 22,246 62,650
Cash paid for:    
Interest 4,105 2,256
Income taxes, net $ 291 $ 920