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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 20,361 $ 13,024 $ 6,317
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization of fixed and intangible assets 16,959 16,327 16,474
Amortization of other long term assets and debt issuance costs 5,221 5,203 5,275
Amortization of discounted liabilities 110 16 140
Stock-based compensation 4,714 3,167 3,881
Excess tax benefit from share based compensation   (96) (23)
Increase (decrease) in deferred income taxes 398 (151) 27
Operating loss from equity method investment 49 353 629
Loss from dilution of equity method investment     7
Changes in assets and liabilities associated with operations, net of business combinations:      
Decrease (increase) in net receivables 754 (11,817) 13,034
Decrease in inventories 16,183 15,901 29,154
(Increase) decrease in income tax receivable/payable, net (12,073) 1,186 4,872
Decrease (increase) in prepaid expenses and other assets 647 (3,872) 2,082
Increase (decrease) in accounts payable 3,322 9,015 (5,068)
Increase (decrease) in deferred revenue 10,726 (5,040) 7,990
Decrease in accrued program costs (4,529) (1,441) (8,175)
(Decrease) increase in other payables (3,841) 4,631 1,952
Net cash provided by operating activities 59,001 46,406 78,568
Cash flows from investing activities:      
Capital expenditures (6,666) (10,630) (6,899)
Investment (950) (3,283) (125)
Acquisitions of businesses and intangible assets (81,896) (224) (36,667)
Net cash used in investing activities (89,512) (14,137) (43,691)
Cash flows from financing activities:      
Payments under line of credit agreement (103,975) (107,600) (121,400)
Borrowings under line of credit agreement 141,000 80,000 90,880
Debt issuance cost (751)    
Payment on other long-term liabilities (26) (704) (1,543)
Excess tax benefit from share based compensation   96 23
Net payment from the issuance of common stock (sale of stock under ESPP, exercise of stock options and shares purchased for tax withholding) (713) 241 317
Payment of cash dividends (1,600) (578) (1,141)
Net cash provided by (used in) financing activities 33,935 (28,545) (32,864)
Net increase in cash and cash equivalents 3,424 3,724 2,013
Effect of exchange rate changes on cash and cash equivalents 44 (1,379) (1,374)
Cash and cash equivalents at beginning of year 7,869 5,524 4,885
Cash and cash equivalents at end of year 11,337 7,869 5,524
Cash paid (received) during the year for:      
Interest 1,500 1,748 2,750
Income taxes, net $ 17,841 $ 4,947 $ (3,697)