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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 3,906 $ 4,605
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization of fixed and intangible assets 4,609 4,983
Amortization of other long term assets and debt issuance costs 1,082 1,163
Amortization of discounted liabilities   102
Provision for bad debts 1,034 251
Revision of deferred compensation (1,543)  
Stock-based compensation 1,485 1,309
Decrease in deferred income taxes (742)  
Operating loss from equity method investments 24 217
Changes in assets and liabilities associated with operations:    
Decrease (increase) in net receivables 6,812 (9,554)
Increase in inventories (23,763) (19,558)
Increase in prepaid expenses and other assets (2,724) (562)
Decrease (increase) in income tax receivable/payable, net 750 (497)
Increase in accounts payable 4,960 9,613
Decrease in deferred revenue (16,036) (2,740)
Increase in accrued program costs 2,391 4,634
Decrease in other payables and accrued expenses (2,508) (3,201)
Net cash used in by operating activities (20,263) (9,235)
Cash flows from investing activities:    
Capital expenditures (3,369) (1,553)
Acquisitions of businesses, product lines and intangible assets (24,246) (815)
Net cash used in investing activities (27,615) (2,368)
Cash flows from financing activities:    
Payments under line of credit agreement (23,400) (23,000)
Borrowings under line of credit agreement 76,000 35,800
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholdings) (550) 810
Repurchase of common stock (2,604)  
Payment of cash dividends (581) (438)
Net cash provided by financing activities 48,865 13,172
Net increase in cash and cash equivalents 987 1,569
Effect of exchange rate changes on cash and cash equivalents (498) 112
Cash and cash equivalents at beginning of period 6,168 11,337
Cash and cash equivalents at end of period 6,657 $ 13,018
Non-cash investing activities:    
Deferred consideration in connection with the business acquisitions completed in January 2019: $ 2,645