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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 16,819 $ 8,734
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of fixed and intangible assets 3,699 3,469
Amortization of other long term assets 836 682
Amortization of discounted liabilities 42 198
Stock-based compensation 688 422
Tax benefit from exercise of stock options (57) (43)
Changes in assets and liabilities associated with operations:    
Increase in net receivables (70,908) (30,300)
Increase in inventories (21,538) (3,599)
Increase in prepaid expenses and other assets (7,027) (1,568)
Increase in income tax receivable/payable, net 6,108 3,725
Increase in accounts payable 31,250 1,188
Decrease in deferred revenue (18,148) (7,571)
Increase in other payables and accrued expenses 40,100 17,065
Net cash used in operating activities (18,136) (7,598)
Cash flows from investing activities:    
Capital expenditures (4,396) (5,718)
Investment (3,687)  
Net cash used in investing activities (8,083) (5,718)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 6,200  
Payments on long-term debt (2,500) (2,000)
Payments on other long-term liabilities (682)  
Tax benefit from exercise of stock options 57 43
Decrease in other notes payable (6,154) (6,035)
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock option) 427 417
Net cash used in financing activities (2,652) (7,575)
Net decrease in cash (28,871) (20,891)
Cash and cash equivalents at beginning of period 38,476 35,085
Effect of exchange rate changes on cash 390 538
Cash and cash equivalents as of March 31 $ 9,995 $ 14,732