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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 33,830 $ 25,554
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 11,183 9,915
Amortization of other long term assets 2,976 2,061
Amortization of discounted liabilities 130 592
Stock-based compensation 2,895 1,856
Tax benefit from exercise of stock options (57) (493)
Loss from equity method investment 386  
Changes in assets and liabilities associated with operations:    
Increase in net receivables (34,304) (36,515)
Increase in inventories (39,221) (21,747)
Increase in prepaid expenses and other assets (14,564) (8,862)
(Increase) decrease in income tax receivable/payable, net (520) 644
Increase in accounts payable 412 8,743
Decrease in deferred revenue (20,034) (6,270)
Increase in other liabilities 64,088 37,623
Net cash provided by operating activities 7,200 13,101
Cash flows from investing activities:    
Capital expenditures (12,290) (14,908)
Investment (3,687)  
Net cash used in investing activities (15,977) (14,908)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 38,750  
Payments on long-term debt (46,000) (6,000)
Payments on other long-term liabilities (1,415)  
Tax benefit from exercise of stock options 57 493
Decrease in other notes payable (6,154) (6,460)
Payment of cash dividends (3,390) (1,380)
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 929 3,260
Net cash used in financing activities (17,223) (10,087)
Net decrease in cash (26,000) (11,894)
Cash and cash equivalents at beginning of year 38,476 35,085
Effect of exchange rate changes on cash (151) 433
Cash and cash equivalents as of September 30 $ 12,325 $ 23,624