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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash Flows from Operating Activities    
Net Income (loss) $ 8,811 $ (1,117)
Adjustments to reconcile net income (loss) to net cash used in operating activities    
Depreciation expense 1,361 2,164
Restructuring 309 3,030
Stock-based compensation 762 318
Gain from extinguishment of debt (Paycheck Protection Program Term Note) (10,000) 0
Net pension (payment) cost (596) 261
Deferred income taxes 0 (650)
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and contract assets (5,932) 389
Increase in prepaid expenses, income tax receivable and other current assets (590) (11,963)
Decrease in accounts payable and accrued expenses 653 472
Increase (decrease) in other accrued expenses and liabilities 508 (349)
Net cash used in operating activities (4,714) (7,445)
Cash Flows from Investing Activities    
Purchases of property, plant and equipment (984) (25)
Proceeds from sale of property, plant and equipment 101 1,813
Net cash (used in) provided by investing activities (883) 1,788
Cash Flows from Financing Activities    
Borrowings 0 10,000
Repayment of borrowings (4,000) (1,500)
Debt financing costs (301) (275)
Payment of finance leases (112) (191)
Treasury stock activities (118) 0
Net cash (used in) provided by financing activities (4,531) 8,034
Effect of exchange rate changes on cash, cash equivalents and restricted cash (462) (62)
Net (decrease) increase in cash and cash equivalents and restricted cash (10,590) 2,315
Cash and cash equivalents and restricted cash at beginning of period 33,562 34,122
Cash and cash equivalents and restricted cash at end of period 22,972 36,437
Supplemental disclosures    
Cash paid for interest 264 328
Cash paid (received) for income taxes, net 959 (44)
Non-cash investing and financing activities    
Purchases of property, plant and equipment included in accounts payable $ 1,322 $ 2,244