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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 25,554 $ 15,637
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 9,915 10,366
Amortization of other long term assets 2,061 2,018
Amortization of discounted liabilities 592 636
Stock-based compensation 1,856 1,486
Tax benefit from exercise of stock options (493)  
Changes in assets and liabilities associated with operations:    
Increase in net receivables (36,515) (62,895)
Increase in inventories (21,747) (6,765)
Increase in prepaid expenses and other assets (8,862) (885)
Decrease in income tax receivable/payable, net 644 9,146
Increase in accounts payable 8,743 7,942
Decrease in deferred revenue (6,270) (5,557)
Increase in other liabilities 37,623 30,976
Net cash provided by operating activities 13,101 2,105
Cash flows from investing activities:    
Capital expenditures (14,908) (4,466)
Net cash used in investing activities (14,908) (4,466)
Cash flows from financing activities:    
Net repayments under line of credit agreement   (7,300)
Principal payments on long-term debt (6,000) (6,829)
Tax benefit from exercise of stock options 493  
Borrowings on long-term debt   20,063
Decrease in other notes payable (6,460)  
Payment of cash dividends (1,380) (826)
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 3,260 574
Net cash (used in) provided by financing activities (10,087) 5,682
Net (decrease) increase in cash (11,894) 3,321
Cash and cash equivalents at beginning of year 35,085 1,158
Effect of exchange rate changes on cash 433 (647)
Cash and cash equivalents as of September 30 $ 23,624 $ 3,832