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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 3,413 $ 2,947
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 3,939 4,315
Amortization of other long term assets 1,423 1,092
Amortization of discounted liabilities 6 9
Stock-based compensation 1,080 456
Excess tax benefit from exercise of stock options   (35)
Increase in deferred income taxes 8  
Loss from equity method investment 42 82
Changes in assets and liabilities associated with operations:    
Decrease (increase) in net receivables 11,422 (10,202)
Increase in inventories (1,366) (7,938)
Increase in prepaid expenses and other assets (1,126) (1,036)
Decrease in income tax receivable/payable, net 793 1,205
(Decrease) increase in accounts payable (3,025) 13,031
Decrease in deferred revenue (394) (1,848)
Increase in other payables and accrued expenses 955 7,512
Net cash provided by operating activities 17,170 9,590
Cash flows from investing activities:    
Capital expenditures (3,080) (715)
Investment (300) (3,283)
Net cash used in investing activities (3,380) (3,998)
Cash flows from financing activities:    
Payments under line of credit agreement (27,000) (14,600)
Borrowings under line of credit agreement 16,000 12,000
Payments on other long-term liabilities   (373)
Tax benefit from exercise of stock options   35
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) 303 (315)
Payment of cash dividends (289)  
Net cash used in by financing activities (10,986) (3,253)
Net increase in cash and cash equivalents 2,804 2,339
Cash and cash equivalents at beginning of period 7,869 5,524
Effect of exchange rate changes on cash and cash equivalents 119 53
Cash and cash equivalents at end of period $ 10,792 $ 7,916