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Fair Value Measurement (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ 106,637 $ 41,233
Available-for-sale Securities, Gross Realized Gain (Loss) 0  
Long-term investment securities $ 57,162 $ 0