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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 $ 42,942 $ 20,254
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,663 3,691
Provision For Reduction Of Doubtful Accounts 29 75
Noncash stock compensation 212 220
Deferred tax provision 6,262 31
Change in fair value of derivatives    (30)
Changes in:    
Accounts receivable (46,281) 16,008
Inventories 29,260 (15,155)
Other assets 1,332 (370)
Accounts payable and accrued expenses (28,878) (29,220)
Income taxes, net 10,983 3,411
Net cash provided by (used in) operating activities 19,524 (1,085)
Cash flows from investing activities:    
Purchases of short-term investments (172,118)   
Purchases of equipment and leasehold improvements (1,425) (3,953)
Payment for intangible assets acquired (518) (2,341)
Net cash provided used in investing activities (174,061) (6,294)
Cash flows from financing activities:    
Proceeds from (repayments of) loans payable - banks, net (278) 1,443
Repayment of long-term debt    (1,418)
Proceeds from exercise of options 256 247
Proceeds from sale of stock of subsidiary    145
Dividends paid (2,453) (2,443)
Net cash used in financing activities (2,475) (2,026)
Effect of exchange rate changes on cash (4,118) 959
Net decrease in cash and cash equivalents (161,130) (8,446)
Cash and cash equivalents - beginning of period 307,335 35,856
Cash and cash equivalents - end of period 146,205 27,410
Supplemental disclosure of cash flow information:    
Interest 446 369
Income taxes $ 8,273 $ 8,062