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Derivatives (Fair Value of Derivative Instruments and Locations in Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Current derivative liability $ 59,962 $ 1,047
Non-current derivative liability 28,069 4,659
Derivative Liability, Total $ 88,031 $ 5,706