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Derivative Financial Instruments Impact of Fair Value on Qualifying Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 3,467 $ 2,810   $ 7,605    
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 345,502   $ 345,502     $ 317,486
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings 0 0 0 0    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings (1,505) 1,610 (253) 3,555    
Operating Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings 0 (10,624) (30,693) (26,436)    
Long-term Debt [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 45,502   45,502   $ 48,200 $ 17,486
Long-term Debt [Member] | Operating Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 0 $ 10,624 $ 30,693 $ 26,436