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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (2,904) $ 3,637   $ 4,795  
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 346,841   $ 346,841   $ 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 (609) 992 1,252 1,945  
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 (14,184) (30,693) (15,812)  
Long-term Debt [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 46,841   46,841   $ 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 $ 14,184 $ 30,693 $ 15,812