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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
Mar. 31, 2016
Dec. 31, 2015
Fair Value Measurement of Assets and Liabilities [Abstract]    
One year or less $ 195,248  
One year to two years 102,721  
Two years to three years 60,613  
Three years to four years 11,444  
Four years to five years 13,005  
More than five years 106  
Total $ 383,137 $ 375,283