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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net income (loss) $ 51,918 $ (23,360) $ (20,145)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization expense 163,468 172,260 139,767
Equity in income of joint ventures (16,422) (12,853) (15,731)
Stock-based compensation expense 26,352 19,574 18,486
Changes in fair value of investments 0 0 1,199
Elimination of unrealized profit on sales to joint ventures 4 4,159 0
Deferred taxes (5,765) (10,478) (1,326)
Unrealized foreign exchange losses 5,861 5,658 6,116
Changes in fair value of contingent consideration (6,079) 576 0
Changes in assets and liabilities:      
Accounts receivable, net (17,301) (34,895) (97,758)
Inventories 4,931 10,575 (26,037)
Other assets (12,388) (16,745) 4,365
Accounts payable and accrued liabilities (11,076) 34,600 35,491
Other liabilities (19,813) (18,275) 31,435
Income taxes, net 11,905 8,798 10,209
Dividends received from joint ventures 8,231 8,329 7,283
Other (14,347) (9,614) (13,185)
Net cash provided by operating activities 169,479 138,309 80,169
Cash flows from investing activities:      
Capital expenditures (143,576) (122,110) (81,904)
Payment for acquired businesses, net of cash acquired (31,967) (28,707) 0
Proceeds from settlement of contingent consideration 7,500
Acquisition of technology 0 0 (7,967)
Proceeds from disposal of assets 2,900 2,013 7,279
Proceeds from sale / maturity of investments 0 572 11,386
Net cash used in investing activities (165,143) (148,232) (71,206)
Cash flows from financing activities:      
Release of (cash pledged for) collateral deposits 1,170 (217) (70)
Payment of contingent consideration (13,873) 0 0
Payments of loan issuance and other transaction costs 0 0 (132)
Proceeds from long-term borrowings 117,269 50,000 0
Repayments of long-term borrowings (44,351) (65,096) 0
Repurchase of common stock (14,155) (20,024) (12,996)
Payment of withholding taxes on stock-based compensation plans (3,431) (2,559) (4,168)
Repayment of financed insurance premium (10,920) (9,317) (7,245)
Repayments of finance leases (2,137) (2,126) (1,001)
Net cash provided by (used in) financing activities 29,572 (49,339) (25,612)
Effect of exchange rate changes on cash and cash equivalents (2,411) (6,032) (4,738)
Net increase (decrease) to cash and cash equivalents and restricted cash 31,497 (65,294) (21,387)
Cash and cash equivalents and restricted cash at beginning of year 153,166 218,460 239,847
Cash and cash equivalents and restricted cash at end of year $ 184,663 $ 153,166 $ 218,460