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Fair Value Measurement of Assets and Liabilities (Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Measurement of Assets and Liabilities [Abstract]    
One year or less $ 163,899  
One year to two years 126,528  
Two years to three years 57,707  
Three years to four years 11,349  
Four years to five years 13,740  
Total $ 373,223 $ 346,099