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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value on Non-Recurring Basis      
Fair value assets level 1 to 2 transfers $ 0 $ 0 $ 0
Fair value assets level 2 to 1 transfers 0 0 0
Fair value liabilities level 1 to 2 transfers 0 0 0
Fair value liabilities level 2 to 1 transfers $ 0 $ 0 $ 0