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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 20,254 $ 17,340
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,691 2,980
Provision for doubtful accounts 75 980
Noncash stock compensation 220 266
Deferred tax (benefit) 31 (297)
Change in fair value of derivatives (30) (119)
Changes in:    
Accounts receivable 16,008 (19,458)
Inventories (15,155) (25,269)
Other assets (370) 687
Accounts payable and accrued expenses (29,220) 17,285
Income taxes payable, net 3,411 3,773
Net cash used in operating activities (1,085) (1,832)
Cash flows from investing activities:    
Purchases of short-term investments   (3,930)
Proceeds from sale of short-term investments   12,996
Purchases of equipment and leasehold improvements (3,953) (3,287)
Payment for intangible assets acquired (2,341) (286)
Net cash provided by (used in) investing activities (6,294) 5,493
Cash flows from financing activities:    
Proceeds from loans payable - banks, net 1,443 756
Repayment of long-term debt (1,418) (2,856)
Proceeds from exercise of options 247 445
Proceeds from sale of stock of subsidiary 145 1,128
Dividends paid (2,443) (1,979)
Net cash used in financing activities (2,026) (2,506)
Effect of exchange rate changes on cash 959 2,276
Net increase (decrease) in cash and cash equivalents (8,446) 3,431
Cash and cash equivalents - beginning of period 35,856 37,548
Cash and cash equivalents - end of period 27,410 40,979
Cash paid for:    
Interest 369 447
Income taxes $ 8,062 $ 3,792