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Derivatives and Hedging Activities Net Gains (Losses) on Cash Flow Hedging Relationships (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Expense [Member] | Forward-start interest rate swaps [Member] | COs - bonds [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Losses reclassified from accumulated other comprehensive loss into interest expense $ (5,218)    
Losses reclassified from accumulated other comprehensive loss into interest expense   $ (3,171) $ (10,575)
Gain (Loss) on Derivative Instruments [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain recognized in net gains on derivatives and hedging activities [1]   227 280
Gain (Loss) on Derivative Instruments [Member] | Forward-start interest rate swaps [Member] | COs - bonds [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain recognized in net gains on derivatives and hedging activities   227 280
Other Comprehensive Income (Loss) [Member] | Forward-start interest rate swaps [Member] | COs - bonds [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
(Losses) gains recognized in other comprehensive income $ (6,131) $ 7,907 $ (2,838)
[1]
Consists of forward-start interest-rate swaps.