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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income $ 13,601 $ 24,062 $ 20,361
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization of property, plant and equipment and intangible assets 18,643 18,891 16,959
Amortization of other long term assets 4,207 4,884 5,221
Amortization of discounted liabilities 72 359 110
Provision for bad debts 1,035 1,216 5
Reassessment of deferred consideration (4,120) (6,050)  
Stock-based compensation 7,160 5,805 4,714
Increase (decrease) in deferred income taxes 2,616 (561) 398
Loss from equity method investments 209 389 49
Changes in assets and liabilities associated with operations, net of business combinations:      
(Increase) decrease in net receivables (11,383) (22,536) 749
(Increase) decrease in inventories 3,817 (31,440) 16,183
(Increase) decrease in income tax receivable, net (6,855) 2,655 (12,073)
(Increase) decrease in prepaid expenses and other assets (876) 186 647
Increase in net operating lease liability 149    
Increase (decrease) in accounts payable (7,977) 9,097 3,322
Increase (decrease) in deferred revenue (13,355) 5,468 10,726
Increase (decrease) in accrued program costs 5,797 (1,705) (4,529)
Increase (decrease) in other payables and accrued expenses (3,337) 626 (3,841)
Net cash provided by operating activities 9,403 11,346 59,001
Cash flows from investing activities:      
Capital expenditures (12,985) (8,050) (6,666)
Investments     (950)
Acquisitions of businesses and product lines, and intangible assets additions (41,852) (19,647) (81,896)
Net cash used in investing activities (54,837) (27,697) (89,512)
Cash flows from financing activities:      
Net borrowings under line of credit agreement 51,900 18,975 37,025
Debt issuance cost     (751)
Cash paid to acquire non-controlling interest   (73)  
Payment on deferred consideration (850)   (26)
Net receipt (payment) from the issuance of common stock (sale of stock under ESPP, exercise of stock options and shares purchased for tax withholding) 283 1,717 (713)
Repurchase of common stock (2,604) (7,287)  
Payment of cash dividends (2,323) (2,199) (1,600)
Net cash provided by financing activities 46,406 11,133 33,935
Net increase (decrease) in cash and cash equivalents 972 (5,218) 3,424
Effect of exchange rate changes on cash and cash equivalents (559) 49 44
Cash and cash equivalents at beginning of year 6,168 11,337 7,869
Cash and cash equivalents at end of year 6,581 6,168 11,337
Cash paid during the year for:      
Interest 7,121 3,319 1,500
Income taxes, net $ 9,276 8,449 $ 17,841
Non-cash investing activities:      
Consideration paid in January 2019 in connection with an asset acquisition completed in 2018   $ 3,530