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FAIR VALUE MEASUREMENTS (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other than temporary impairment of investments $ 0 $ 0
Fair Value [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 39,086,000 970,000
Short-term investments 246,986,000 243,088,000
Long-term investments 3,888,000 3,047,000
Fair Value [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Short-term investments 0 0
Long-term investments 0 0
Fair Value [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Short-term investments 0 0
Long-term investments 0 0
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 39,086,000 970,000
Short-term investments 246,986,000 243,088,000
Long-term investments $ 3,888,000 $ 3,047,000