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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 9,170 $ 3,400
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 12,367 12,190
Amortization of other long term assets 3,935 3,992
Amortization of discounted liabilities 28 118
Stock-based compensation 1,656 2,943
Tax benefit from exercise of stock options (82) (8)
Operating loss from equity method investment 309 580
Changes in assets and liabilities associated with operations:    
Increase in net receivables (19,202) (6,172)
(Increase) decrease in inventories (5,201) 4,135
(Increase) decrease in prepaid expenses and other assets (1,011) 1,143
Decrease in income tax receivable/payable, net 1,519 4,739
Increase in accounts payable 7,925 3,010
Decrease in deferred revenue (8,847) (860)
Increase in program payables 30,536 20,982
Increase in other payables and accrued expenses 3,098 1,615
Net cash provided by operating activities 36,200 51,807
Cash flows from investing activities:    
Capital expenditures (6,122) (5,196)
Investments (3,283) (125)
Acquisitions of product lines and other intangible assets (224) (36,435)
Net cash used in investing activities (9,629) (41,756)
Cash flows from financing activities:    
Net payments under line of credit agreement (24,000) (16,120)
Increase in other notes payable   10,000
Payments on other long-term liabilities (541) (1,252)
Tax benefit from exercise of stock options 82 8
Payment of cash dividends (289) (1,141)
Net proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 204 254
Net cash used in financing activities (24,544) (8,251)
Net increase in cash and cash equivalents 2,027 1,800
Cash and cash equivalents at beginning of period 5,524 4,885
Effect of exchange rate changes on cash and cash equivalents (957) (1,256)
Cash and cash equivalents at end of period $ 6,594 $ 5,429