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Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Measurements [Abstract]        
Transfers of assets and liabilities between level 1, 2, 3 $ 0 $ 0 $ 0 $ 0