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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income $ 7,334 $ 10,165
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization of property, plant and equipment and intangible assets 14,584 13,892
Amortization of other long-term assets and deferred loan fees 3,185 3,174
Amortization of discounted liabilities 9 41
Provision for bad debts 777 728
Revision of deferred consideration   (3,539)
Stock-based compensation 3,776 5,159
Change in deferred income taxes (1,757) (459)
Change in investment fair value (281)  
Loss from equity method investment 80 149
Net foreign currency adjustment (711) 550
Changes in assets and liabilities associated with operations:    
Increase in net receivables (5,089) (15,839)
Increase in inventories (16,941) (19,713)
Increase in prepaid expenses and other assets (532) (849)
Decrease (increase) in income tax receivable 873 (4,477)
Increase in net operating lease liability 14 117
Decrease in accounts payable (1,759) (5,548)
Decrease in deferred revenue (1,079) (19,800)
Increase in accrued program costs 20,058 20,163
Decrease in other payables and accrued expenses (3,344) (4,967)
Net cash provided by (used in) operating activities 19,197 (21,053)
Cash flows from investing activities:    
Capital expenditures (8,988) (10,546)
Acquisition of business, product lines, and intangible assets (3,942) (31,836)
Investment (1,190)  
Net cash used in investing activities (14,120) (42,382)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 377 68,200
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) (1,064) (30)
Repurchase of common stock   (2,604)
Payment of cash dividends (1,168) (1,741)
Net cash (used in) provided by financing activities (1,855) 63,825
Net increase (decrease) in cash and cash equivalents 3,222 390
Effect of exchange rate changes on cash and cash equivalents (222) (671)
Cash and cash equivalents at beginning of period 6,581 6,168
Cash and cash equivalents at end of period 9,581 5,887
Cash paid during the period for:    
Interest 3,960 5,524
Income taxes, net $ 2,868 $ 8,066