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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 6,317 $ 4,066 $ 33,932
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization of fixed and intangible assets 16,474 16,332 14,845
Amortization of other long term assets 5,275 5,811 4,598
Amortization of discounted liabilities 140 324 174
Stock-based compensation 3,881 4,153 3,819
Excess tax benefit from share based compensation (23) (300) (440)
Increase in deferred income taxes 27 2,619 2,523
Operating loss from equity method investment 629 983 986
Loss (gain) from dilution of equity method investment 7 (954)  
Changes in assets and liabilities associated with operations:      
Decrease (increase) in net receivables 13,034 (13,471) 2,351
Decrease (increase) in inventories 29,154 (25,801) (51,879)
Decrease (increase) in income tax receivable/payable, net 4,872 4,424 (10,961)
Decrease (increase) in prepaid expenses and other assets 2,082 (4,743) (19,733)
(Decrease) increase in accounts payable (5,068) (19,951) 8,252
Increase (decrease) in deferred revenue 7,990 (2,890) (16,639)
(Decrease) increase in other payables, accrued program costs and expenses (6,223) (4,697) 21,958
Net cash provided by (used in) operating activities 78,568 (34,095) (6,214)
Cash flows from investing activities:      
Capital expenditures (6,899) (7,180) (15,260)
Investment (125) (500) (3,687)
Acquisitions of intangible assets (36,667)    
Net cash used in investing activities (43,691) (7,680) (18,947)
Cash flows from financing activities:      
Net (payments) borrowings under line of credit agreement (30,520) 47,850 51,550
Payments on long-term debt     (46,000)
Payment on other long-term liabilities (1,543) (1,756) (1,831)
Excess tax benefit from share based compensation 23 300 440
Decrease in other notes payable     (6,154)
Repurchases of common stock   (1,531) (1,934)
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 317 1,666 1,610
Non-controlling interest contribution   299  
Payment of cash dividends (1,141) (5,672) (4,804)
Net cash (used in) provided by financing activities (32,864) 41,156 (7,123)
Net increase (decrease) in cash and cash equivalents 2,013 (619) (32,284)
Effect of exchange rate changes on cash (1,374) (1,176) 488
Cash and cash equivalents at beginning of year 4,885 6,680 38,476
Cash and cash equivalents at end of year 5,524 4,885 6,680
Cash paid (received) during the year for:      
Interest 2,750 2,298 1,777
Income taxes $ (3,697) $ (8,206) $ 25,271