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OTHER INCOME
 12 Months Ended
Dec. 31, 2011
Other Income and Expenses [Abstract]  
OTHER INCOME, NET
OTHER INCOME, NET

Other income consisted of the following (amounts in thousands):
 
2011
 
2010
 
2009
Discount amortization on prepaid royalty
$
3,149

 
$
—

 
$
—

Investment gain on marketable securities
1,588

 
—

 
—

Interest income
556

 
394

 
211

Gain on purchase transaction
285

 
—

 
—

Investment gain (loss) related to contractual obligations
(302
)
 
824

 
1,343

Other income (expense)
(160
)
 
(113
)
 
186

 
$
5,116

 
$
1,105

 
$
1,740