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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 $ 12,150 $ 42,942
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,545 3,663
Provision for doubtful accounts 8 29
Noncash stock compensation 230 212
Deferred tax provision 447 6,262
Changes in:    
Accounts receivable (20,927) (46,281)
Inventories (850) 29,260
Other assets (1,821) 1,332
Accounts payable and accrued expenses (17,616) (28,878)
Income taxes payable, net (1,425) 10,983
Net cash provided by (used in) operating activities (27,259) 19,524
Cash flows from investing activities:    
Purchases of short-term investments (142,110) (172,118)
Proceeds from sale of short-term investments 96,146   
Purchases of equipment and leasehold improvements (709) (1,425)
Payment for intangible assets acquired (522) (518)
Net cash used in investing activities (47,195) (174,061)
Cash flows from financing activities:    
(Repayments of) loans payable - banks, net (2,866) (278)
Proceeds from exercise of options 695 256
Proceeds from sale of stock of subsidiary 990   
Dividends paid (3,704) (2,453)
Purchase of treasury stock (37)   
Net cash used in financing activities (4,922) (2,475)
Effect of exchange rate changes on cash (680) (4,118)
Net decrease in cash and cash equivalents (80,056) (161,130)
Cash and cash equivalents - beginning of period 125,650 307,335
Cash and cash equivalents - end of period 45,594 146,205
Supplemental disclosure of cash flow information:    
Interest 248 446
Income taxes $ 5,086 $ 8,273