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Fair Value Measurements Fair Value Measurements Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]    
Cost Method Investments $ 25,438 $ 31,816
Cost Method Investments, Fair Value Disclosure $ 32,792 $ 35,369