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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 24,062 $ 20,361 $ 13,024
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization of fixed and intangible assets 18,891 16,959 16,327
Amortization of other long term assets and debt issuance costs 4,884 5,221 5,203
Amortization of discounted liabilities 359 110 16
Stock-based compensation 5,805 4,714 3,167
Excess tax benefit from share based compensation     (96)
(Decrease) increase in deferred income taxes (561) 398 (151)
Operating loss from equity method investments 389 49 353
Changes in assets and liabilities associated with operations, net of business combinations:      
(Increase) decrease in net receivables (21,320) 754 (11,817)
(Increase) decrease in inventories (31,440) 16,183 15,901
Decrease (increase) decrease in income tax receivable/payable, net 2,655 (12,073) 1,186
Decrease (increase) in prepaid expenses and other assets 186 647 (3,872)
Increase in accounts payable 9,097 3,322 9,015
Increase (decrease) in deferred revenue 5,468 10,726 (5,040)
Decrease in accrued program costs (1,705) (4,529) (1,441)
(Decrease) increase in other payables (5,424) (3,841) 4,631
Net cash provided by operating activities 11,346 59,001 46,406
Cash flows from investing activities:      
Capital expenditures (8,050) (6,666) (10,630)
Investments   (950) (3,283)
Acquisitions of businesses and intangible assets (19,647) (81,896) (224)
Net cash used in investing activities (27,697) (89,512) (14,137)
Cash flows from financing activities:      
Payments under line of credit agreement (117,325) (103,975) (107,600)
Borrowings under line of credit agreement 136,300 141,000 80,000
Debt issuance cost   (751)  
Cash paid to acquire non-controlling interest (73)    
Payment on other long-term liabilities   (26) (704)
Excess tax benefit from share based compensation     96
Net payment from the issuance of common stock (sale of stock under ESPP, exercise of stock options and shares purchased for tax withholding) 1,717 (713) 241
Treasury shares (7,287)    
Payment of cash dividends (2,199) (1,600) (578)
Net cash provided by (used in) financing activities 11,133 33,935 (28,545)
Net (decrease) increase in cash and cash equivalents (5,218) 3,424 3,724
Effect of exchange rate changes on cash and cash equivalents 49 44 (1,379)
Cash and cash equivalents at beginning of year 11,337 7,869 5,524
Cash and cash equivalents at end of year 6,168 11,337 7,869
Cash paid during the year for:      
Interest 3,319 1,500 1,748
Income taxes, net 8,449 $ 17,841 $ 4,947
Non-cash investing activities:      
Consideration paid in January 2019 in connection with an asset acquisition completed in 2018 $ 3,530