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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 13,713 $ 7,334
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization of property, plant and equipment and intangible assets 17,045 14,584
Amortization of other long-term assets 2,981 2,966
Accretion of discounted liabilities (10) 9
Amortization of deferred loan fees 294 219
Provision for bad debts 1,202 777
Loan principal and interest forgiveness (672)  
Adjustment to contingent consideration 520  
Stock-based compensation 5,309 3,776
Decrease in deferred income taxes (560) (1,757)
Change in value of equity investments, net (103) (281)
Net foreign currency adjustments (330) (711)
Loss from equity method investment 388 80
Adjustment to bargain purchase gain on business acquisition (171)  
Changes in assets and liabilities associated with operations:    
Increase in net receivables (42,979) (5,089)
Increase in inventories (4,325) (16,941)
Increase in prepaid expenses and other assets (2,194) (532)
Decrease in income tax receivable 2,031 873
Increase in net operating lease liability 183 14
Increase (decrease) in accounts payable 7,769 (1,759)
Decrease in deferred revenue (38,272) (1,079)
Increase in accrued program costs 33,982 20,058
Increase (decrease) in other payables and accrued expenses 4,025 (2,117)
Net cash (used in) provided by operating activities (174) 20,424
Cash flows from investing activities:    
Capital expenditures (7,963) (8,988)
Acquisition of product line (10,000)  
Intangible assets (285) (3,942)
Investments (183) (1,190)
Net cash used in investing activities (18,431) (14,120)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 28,592 377
Payment of contingent consideration (250) (1,227)
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) (2,000) (1,064)
Repurchase of common stock (4,579)  
Payment of cash dividends (1,789) (1,168)
Net cash provided by (used in) financing activities 19,974 (3,082)
Net increase in cash and cash equivalents 1,369 3,222
Effect of exchange rate changes on cash and cash equivalents (574) (222)
Cash and cash equivalents at beginning of period 15,923 6,581
Cash and cash equivalents at end of period 16,718 9,581
Cash paid during the period for:    
Interest 2,839 3,960
Income taxes, net 3,836 2,868
Non-cash transactions:    
ROU assets exchanged for lease liabilities 17,872 $ 4,895
Cash dividends declared and included in accrued expenses $ 594