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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (6,351) $ (11,132)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization expense 34,737 35,012
Equity in income of joint ventures (2,436) (4,202)
Stock-based compensation expense 4,171 6,018
Change in fair value of investments 0 1,502
Elimination of unrealized profit on sales to joint ventures 39 0
Deferred taxes (5,225) (2,448)
Unrealized foreign exchange (1,753) (2,503)
Changes in assets and liabilities:    
Accounts receivable, net (5,761) 2,163
Inventories (2,380) (6,232)
Other assets (11,320) (3,492)
Accounts payable and accrued liabilities 5,362 (13,194)
Other liabilities 11,306 (11,501)
Income taxes, net 3,929 (719)
Other (2,995) (3,434)
Net cash provided by (used in) operating activities 21,323 (14,162)
Cash flows from investing activities:    
Capital expenditures (28,776) (10,577)
Payment for acquisition of business, net of cash acquired (7,536) 0
Acquisition of technology 0 (7,973)
Proceeds from disposal of assets 0 6,422
Proceeds from sale / maturity of investments 0 7,120
Net cash used in investing activities (36,312) (5,008)
Cash flows from financing activities:    
Cash pledged for collateral deposits (10) (61)
Payments of loan issuance and other transaction costs 0 (95)
Acquisition of common stock (10,011) 0
Payment of withholding taxes on stock-based compensation plans (2,954) (1,104)
Repayment of financed insurance premium (2,899) (980)
Repayments of finance leases (499) (154)
Net cash used in financing activities (16,373) (2,394)
Effect of exchange rate changes on cash and cash equivalents (800) 133
Net decrease to cash and cash equivalents and restricted cash (32,162) (21,431)
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 $ 186,298 $ 218,416