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Fair Value Measurements (Fair Value Liabilities Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Measurements [Abstract]        
Beginning Balance $ 0 $ 142 $ 150 $ 195
Change in Fair Value 0 0 0 (53)
Payments 0 0 (150) 0
Ending Balance $ 0 $ 142 $ 0 $ 142