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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 2,810 $ 1,393   $ 8,507  
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 0   $ 0    
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 1,610 1,667 3,555 5,158  
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 (10,624) 0 (26,436) 0  
Long-term Debt [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Liability, Fair Value Hedge 326,436   326,436   $ 0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 26,436   26,436    
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 $ 10,624 $ 0 $ 26,436 $ 0