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Derivative Financial Instruments Impact of Fair Value on Qualifying Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (754) $ (2,904)   $ 5,926  
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 341,488   $ 341,488   $ 344,164
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (Loss) on Fair Value Hedges Recognized in Earnings (2,522) $ (609) (4,983) $ 1,252  
Long-term Debt [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 41,488   $ 41,488   $ 44,164