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Derivative Instruments and Hedging Activities Open Interest Rate Swap Contracts (Details) - Cash Flow Hedging - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Interest rate swap    
Derivative [Line Items]    
Notional Amounts $ 275,000 $ 425,000
Net Unrealized Gain (Loss) (9,589) (2,665)
Interest Rate Swap, May 2018 to May 2021    
Derivative [Line Items]    
Notional Amounts 25,000 25,000
Net Unrealized Gain (Loss) (98) 397
Interest Rate Swap, September 2018 to September 2019    
Derivative [Line Items]    
Notional Amounts 0 250,000
Net Unrealized Gain (Loss) 0 (163)
Interest Rate Swap, September 2019 to September 2023    
Derivative [Line Items]    
Notional Amounts 150,000 150,000
Net Unrealized Gain (Loss) (9,119) (2,899)
Interest Rate Swap, May 2019 To May 2020 [Member] [Member]    
Derivative [Line Items]    
Notional Amounts 100,000 0
Net Unrealized Gain (Loss) $ (372) $ 0