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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 19,817 $ 47,463
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 5,143 6,003
Provision for doubtful accounts 37 118
Noncash stock compensation 457 421
Deferred tax provision 1,976 5,560
Changes in:    
Accounts receivable (17,157) 24,181
Inventories (9,049) 29,212
Other assets (1,336) 876
Accounts payable and accrued expenses (18,127) (39,465)
Income taxes payable, net 6,799 (75,437)
Net cash used in operating activities (11,440) (1,068)
Cash flows from investing activities:    
Purchases of short-term investments (233,794) (199,722)
Proceeds from sale of short-term investments 198,968 79,098
Purchases of equipment and leasehold improvements (1,144) (2,328)
Proceeds from sale of equipment    2,801
Payment for intangible assets acquired (704) (1,804)
Net cash used in investing activities (36,674) (121,955)
Cash flows from financing activities:    
Repayments of loans payable - banks, net (5,836) (27,356)
Proceeds from exercise of options 801 1,197
Proceeds from sale of stock of subsidiary 990   
Dividends paid (7,415) (6,137)
Dividends paid to noncontrolling interest (4,667) (8,341)
Purchase of treasury stock (37)   
Net cash used in financing activities (16,164) (40,637)
Effect of exchange rate changes on cash (1,221) (1,558)
Net decrease in cash and cash equivalents (65,499) (165,218)
Cash and cash equivalents - beginning of period 125,650  
Cash and cash equivalents - end of period 60,151  
Supplemental disclosure of cash flow information:    
Interest 699 887
Income taxes $ 6,453 $ 96,604