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Fair Value of Financial Instruments (Balance Sheet Classification) (Details) - Derivatives designed as hedging instruments - Interest Rate Swap - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset $ 0 $ 4,931
Other Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability $ (5,309) $ (580)