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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 2,005 $ 16,819
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of fixed and intangible assets 3,733 3,699
Amortization of other long term assets 1,454 836
Amortization of discounted liabilities 69 42
Stock-based compensation 768 688
Tax benefit from exercise of stock options (235) (57)
Loss from equity method investment 328  
Gain on dilution of equity method investment (256)  
Changes in assets and liabilities associated with operations:    
Increase in net receivables (30,940) (70,908)
Increase in inventories (18,629) (21,538)
Increase in prepaid expenses and other assets (3,242) (7,027)
Decrease in income tax receivable/payable, net 695 6,108
(Decrease) increase in accounts payable (381) 31,250
Decrease in deferred revenue (2,309) (18,148)
Increase in other payables and accrued expenses 5,050 40,100
Net cash used in operating activities (41,890) (18,136)
Cash flows from investing activities:    
Capital expenditures (1,816) (4,396)
Investment   (3,687)
Net cash used in investing activities (1,816) (8,083)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 47,450 6,200
Payments on long-term debt   (2,500)
Payments on other long-term liabilities (356) (682)
Tax benefit from exercise of stock options 235 57
Decrease in other notes payable   (6,154)
Repurchases of common stock (1,531)  
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 1,018 427
Payment of cash dividends (1,418)  
Net cash provided (used) by financing activities 45,398 (2,652)
Net increase (decrease) in cash and cash equivalents 1,692 (28,871)
Cash and cash equivalents at beginning of period 6,680 38,476
Effect of exchange rate changes on cash 19 390
Cash and cash equivalents as of the end of the period $ 8,391 $ 9,995