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Fair Value Measurements (Fair Value Assets Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurements [Abstract]    
Beginning Balance $ 0 $ 0
Increase in value 45 0
Ending Balance $ 45 $ 0