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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 2,944 $ (15,482)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:    
Depreciation and amortization expense 71,972 70,404
Equity in income of joint ventures (5,241) (6,631)
Stock-based compensation expense 9,748 10,248
Change in fair value of investments 0 1,538
Elimination of unrealized profit on sales to joint ventures 450 0
Deferred taxes (6,823) (1,929)
Unrealized foreign exchange losses (gains) (1,820) 2,647
Changes in assets and liabilities:    
Accounts receivable, net (17,004) (52,971)
Inventories (1,440) (15,441)
Other assets (14,878) 1,012
Accounts payable and accrued liabilities 31,919 11,217
Other liabilities (25,722) (12,840)
Income taxes, net 2,994 568
Dividends from joint ventures 2,754 2,985
Other (3,172) (7,432)
Net cash provided by (used in) operating activities 46,681 (12,107)
Cash flows from investing activities:    
Capital expenditures (57,968) (31,526)
Payment for acquisition of business, net of cash acquired (7,536) 0
Acquisition of technology 0 (7,967)
Proceeds from disposal of assets 2,013 6,579
Proceeds from sale / maturity of investments 0 8,169
Net cash used in investing activities (63,491) (24,745)
Cash flows from financing activities:    
Release of (Cash pledged for) collateral deposits, net 494 (256)
Payments of loan issuance and other transaction costs 0 (132)
Acquisition of common stock (10,011) (12,309)
Payment of withholding taxes on stock-based compensation plans (2,835) (4,291)
Repayment of financed insurance premium (4,277) (2,805)
Repayment of finance leases (1,164) (409)
Net cash used in financing activities (17,793) (20,202)
Effect of exchange rate changes on cash and cash equivalents (2,986) (3,382)
Net decrease to cash and cash equivalents and restricted cash (37,589) (60,436)
Cash and cash equivalents and restricted cash at beginning of period 218,460 239,847
Cash and cash equivalents and restricted cash at end of period $ 180,871 $ 179,411