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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities $ 6,500,000 $ 4,400,000
Other than Temporary Impairment Losses, Investments 0 500,000
4.00% Convertible Senior Notes
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stated interest rate 4.00% 4.00%
Convertible debt fair value $ 153,400,000