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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net (loss) earnings $ (3,804) $ 1,131
Adjustments to reconcile net (loss) earnings to net cash provided by (used in) operating activities:    
Depreciation and amortization 4,126 4,110
Stock-based compensation 603 813
Amortization of deferred financing costs 149 115
Deferred income taxes (1,322) (756)
Net unrealized gains/losses on foreign currency revaluation (45) 573
Other, net (215) 950
Changes in operating assets and liabilities:    
Accounts receivable, net 6,682 (2,285)
Unbilled receivables 2,721 5,569
Inventories 2,059 (4,239)
Accounts payable (4,891) (8,493)
Accrued expenses (2,884) (5,044)
Other operating assets/liabilities, net 4,879 1,299
Net cash provided by (used in) operating activities 8,058 (6,257)
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,832) (2,437)
Proceeds from disposal/sale of property, plant and equipment 2 2
Net cash used in investing activities (1,830) (2,435)
Cash flows from financing activities:    
Dividends paid to common stockholders (806) (800)
Deferred financing costs (600)
Borrowings under revolving credit line 10,000
Repayments of revolving credit line (10,000)
Repayments of long-term debt (8,179) (744)
Net cash used in financing activities (9,585) (1,544)
Effect of exchange rate changes on cash and cash equivalents (501) (484)
Net decrease in cash and cash equivalents (3,858) (10,720)
Cash and cash equivalents - beginning of period 72,289 53,911
Cash and cash equivalents - end of period 68,431 43,191
Supplementary information:    
Income taxes, net of refunds received 857 926
Interest payments $ 1,266 $ 1,216