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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 7,944 $ 6,329
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 8,094 8,359
Amortization of other long term assets 2,777 2,358
Amortization of discounted liabilities 13 19
Stock-based compensation 2,322 1,068
Excess tax benefit from exercise of stock options   (47)
Increase in deferred income taxes 7  
Loss from equity method investment 111 129
Changes in assets and liabilities associated with operations:    
Decrease (increase) in net receivables 20,749 (4,156)
Increase in inventories (5,506) (14,625)
Increase in prepaid expenses and other assets (2,658) (2,661)
(Increase) decrease in income tax receivable/payable, net (12,752) 1,244
Increase in accounts payable 579 9,837
Decrease in deferred revenue (2,126) (1,932)
Increase in program payables 18,819 17,956
(Decrease) increase in other payables and accrued expenses (4,256) 1,612
Net cash provided by operating activities 34,117 25,490
Cash flows from investing activities:    
Capital expenditures (4,155) (1,729)
Investment (950) (3,283)
Acquisition of product lines and other intangible assets (13,400) (224)
Net cash used in investing activities (18,505) (5,236)
Cash flows from financing activities:    
Payments under line of credit agreement (59,025) (45,850)
Borrowings under line of credit agreement 45,000 27,000
Payments on other long-term liabilities (26) (457)
Tax benefit from exercise of stock options   47
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) (1,214) (195)
Payment of cash dividends (724)  
Net cash used in by financing activities (15,989) (19,455)
Net (decrease) increase in cash and cash equivalents (377) 799
Effect of exchange rate changes on cash and cash equivalents 105 (524)
Cash and cash equivalents at beginning of period 7,869 5,524
Cash and cash equivalents at end of period $ 7,597 $ 5,799