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Fair Value Measurements (Fair Value of Financial Assets and Liabilities Measured at Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents-term deposits $ 788,337 $ 1,129,833
Short-term investments:    
Trading securities 180 173
Available-for-sale investments    
Listed equity securities 0 43,558
Bank financial products 31,868 14,505
Others 500 500
Long-term investments    
Listed equity securities 28,413 47,644
Debt securities 7,471 0
Contingent consideration (2,168) (22,168)
Total 854,601 1,214,045
Quoted prices in active markets for identical instruments (level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents-term deposits 788,337 1,129,833
Short-term investments:    
Trading securities 180 173
Available-for-sale investments    
Listed equity securities 0 43,558
Bank financial products 0 0
Others 0 0
Long-term investments    
Listed equity securities 28,413 47,644
Debt securities 0 0
Contingent consideration 0 0
Total 816,930 1,221,208
Significant other observable inputs (level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents-term deposits 0 0
Short-term investments:    
Trading securities 0 0
Available-for-sale investments    
Listed equity securities 0 0
Bank financial products 31,868 14,505
Others 500 500
Long-term investments    
Listed equity securities 0 0
Debt securities 0 0
Contingent consideration 0 0
Total 32,368 15,005
Significant unobservable inputs (level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents-term deposits 0 0
Short-term investments:    
Trading securities 0 0
Available-for-sale investments    
Listed equity securities 0 0
Bank financial products 0 0
Others 0 0
Long-term investments    
Listed equity securities 0 0
Debt securities 7,471 0
Contingent consideration (2,168) (22,168)
Total $ 5,303 $ (22,168)