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Fair Value Measurements (Narrative) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets measured at fair value on non-recurring basis $ 0  
Liabilities measured at fair value on non-recurring basis 0  
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of liabilities 0 $ 0
Fair value of assets 0 0
Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of liabilities 0 0
Fair value of assets $ 0 $ 0