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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (11,132) $ (20,392)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization expense 35,012 27,759
Equity in income of joint ventures (4,202) (4,092)
Stock-based compensation expense 6,018 0
Change in fair value of investments 1,502 0
Elimination of unrealized profit on sales to joint ventures 0 5
Deferred taxes (2,448) (656)
Unrealized foreign exchange (2,503) 1,255
Changes in assets and liabilities:    
Accounts receivable, net 2,163 (3,679)
Inventories (6,232) (2,766)
Other assets (3,492) 1,410
Accounts payable and accrued liabilities (13,194) 4,288
Other liabilities (11,501) 6,324
Income taxes, net (719) 1,794
Other (3,434) (1,609)
Net cash (used in) provided by operating activities (14,162) 9,641
Cash flows from investing activities:    
Capital expenditures (10,577) (19,168)
Acquisition of technology (7,973) 0
Proceeds from disposal of assets 6,422 0
Proceeds from sale of investments 7,120 0
Net cash used in investing activities (5,008) (19,168)
Cash flows from financing activities:    
Cash pledged for collateral deposits (61) (287)
Payments of loan issuance and other transaction costs (95) (175)
Payment of withholding taxes on stock-based compensation plans (1,104) 0
Repayment of financed insurance premium (980) 0
Repayments of finance leases (154) (340)
Net cash used in financing activities (2,394) (802)
Effect of exchange rate changes on cash and cash equivalents 133 (272)
Net decrease to cash and cash equivalents and restricted cash (21,431) (10,601)
Cash and cash equivalents and restricted cash at beginning of period 239,847 120,709
Cash and cash equivalents and restricted cash at end of period $ 218,416 $ 110,108