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Investments
3 Months Ended
Mar. 31, 2015
Investments, All Other Investments [Abstract]  
Investments
Investments
Investments in Privately-held Companies    
We have equity investments of approximately $33.6 million in privately held companies which are accounted for under the cost method. There were no impairments recognized on our investments for the three months ended March 31, 2015 as there were no significant identified events or changes in circumstances that would be considered an indicator for impairment.
Notes Receivable
We have a $3.0 million promissory note with a privately held company which was recorded at cost. The interest rate on the promissory note is 8.0% per annum and is payable quarterly. All unpaid principal and accrued interest on the promissory note is due and payable on the earlier of August 26, 2017, or upon default.