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OTHER INCOME (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
OTHER INCOME, NET [Abstract]      
Discount amortization on prepaid royalty $ 3,149 $ 0 $ 0
Investment gain on marketable securities 1,588 0 0
Gain on purchase transaction 285 0 0
Interest income 556 394 211
Investment gain (loss) related to contractual obligations (302) 824 1,343
Other income (expense) (160) (113) 186
Nonoperating Income (Expense) $ 5,116 $ 1,105 $ 1,740