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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities    
Net income (loss) $ 6,188 $ (7,671)
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
Depreciation and amortization 7,602 6,998
Provision for severance benefits 3,240 3,507
Amortization of debt issuance costs and original issue discount   261
Loss on foreign currency, net 29,183 13,353
Provision for inventory reserves 5,282 3,346
Stock-based compensation 3,626 4,051
Other, net 712 266
Changes in operating assets and liabilities    
Accounts receivable, net (12,377) 5,098
Inventories (5,486) (7,170)
Other receivables 11,640 (4,841)
Other current assets (2,089) 8,623
Accounts payable 2,429 1,040
Other accounts payable (5,861) (674)
Accrued expenses (2,709) (2,298)
Accrued income taxes (11,513) (10,249)
Other current liabilities (2,153) (102)
Other non-current liabilities 570 (274)
Payment of severance benefits (2,934) (2,836)
Other, net (385) (62)
Net cash provided by operating activities 24,965 10,366
Cash flows from investing activities    
Proceeds from settlement of hedge collateral 2,805 972
Payment of hedge collateral (6,844) (585)
Purchase of property, plant and equipment (1,511) (4,866)
Payment for intellectual property registration (153) (288)
Collection of guarantee deposits   307
Payment of guarantee deposits (1,049) (4,960)
Other, net 14 (130)
Net cash used in investing activities (6,738) (9,550)
Cash flows from financing activities    
Proceeds from exercise of stock options 1,786 2,549
Acquisition of treasury stock (1,826) (1,653)
Repayment of financing related to water treatment facility arrangement (261) (288)
Repayment of principal portion of finance lease liabilities (32) (33)
Net cash provided by (used in) financing activities (333) 575
Effect of exchange rates on cash and cash equivalents (23,644) (9,451)
Net decrease in cash and cash equivalents (5,750) (8,060)
Beginning of the period 279,547 279,940
End of the period 273,797 271,880
Supplemental cash flow information    
Cash paid for interest   2,094
Cash paid for income taxes 14,022 11,227
Non-cash investing activities    
Property, plant and equipment additions in other accounts payable $ 4,050 $ 3,632
Exchange of exchangeable senior notes into common stock   83,740