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Fair Value (Reconciliation Of Financial Instruments Classified As Level 3) (Details) - Derivative Financial Instruments, net Liabilities [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 864 $ 3,046
Unrealized gain recognized in earnings   53
Issuances 1,889 2,846
Settlements (2,210) (5,081)
Ending balance $ 543 $ 864