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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 2,716 $ (14,568)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 30,793 35,056
Stock-based compensation expense 3,361 3,504
Amortization of deferred financing costs 892 944
Deferred income tax provision 997 2,584
Gains on disposals of assets (561) (1,185)
Settlement of disputes with seller of GEODynamics, Inc. 0 620
Other, net (267) 360
Changes in operating assets and liabilities, net of effect from acquired business:    
Accounts receivable 39,042 (20,469)
Inventories (21,197) (14,664)
Accounts payable and accrued liabilities (25,924) (5,994)
Deferred revenue 8,237 4,647
Other operating assets and liabilities, net 653 (870)
Net cash flows provided by (used in) operating activities 38,742 (10,035)
Cash flows from investing activities:    
Capital expenditures (17,338) (6,453)
Proceeds from disposition of property and equipment 690 1,652
Acquisition of business, net of cash acquired 0 (8,125)
Other, net (66) (85)
Net cash flows used in investing activities (16,714) (13,011)
Cash flows from financing activities:    
Revolving credit facility borrowings 35,592 9,725
Revolving credit facility repayments (35,592) (9,725)
Repayment of 1.50% convertible senior notes (17,315) (6,272)
Other debt and finance lease repayments (226) (359)
Payment of financing costs (95) (74)
Purchases of treasury stock (3,001) 0
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards (1,948) (1,002)
Net cash flows used in financing activities (22,585) (7,707)
Effect of exchange rate changes on cash and cash equivalents 959 147
Net change in cash and cash equivalents 402 (30,606)
Cash and cash equivalents, beginning of period 42,018 52,852
Cash and cash equivalents, end of period 42,420 22,246
Cash paid (received) for:    
Interest 4,060 4,105
Income taxes, net $ (1,475) $ 291