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Fair Value Measurement (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current $ 49,475 $ 41,233 [1]
Long-term investment securities 57,162 0
Available-for-sale Securities 106,637 41,233
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 49,475  
Long-term investment securities 57,162  
Available-for-sale Securities 106,637 41,233
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 0  
Long-term investment securities 0  
Available-for-sale Securities 0 0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 13,645  
Long-term investment securities 17,206  
Available-for-sale Securities 30,851 8,785
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 35,830  
Long-term investment securities 39,956  
Available-for-sale Securities $ 75,786 $ 32,448
[1] December 31, 2015 balances were derived from audited consolidated financial statements.