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Fair Value Measurements (Fair Value Liabilities Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurements [Abstract]    
Beginning Balance $ 150 $ 195
Credit to earnings 0 (45)
Payments (150) 0
Ending Balance $ 0 $ 150