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Derivative Financial Instruments (Schedule Of Fair Values Of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 21,985 $ 14,515
Liability Derivatives, Fair Value 10,997 7,771
Net unrealized gains on exchange traded futures and options contracts included in balance sheet 9,300  
Net unrealized gains on cash flow hedges 3,300 3,400
Net unrealized gains on derivative financial instruments 2,800 100
Derivative Financial Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 21,956 [1] 14,515 [2]
Liability Derivatives, Fair Value 10,997 [3] $ 7,771
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 29  
[1] At December 31, 2020, derivative financial instruments, as reflected on the balance sheet, includes net unrealized gains on exchange traded futures and options contracts of $3.3 million, which include $2.8 million of net unrealized gains on derivative financial instruments designated as cash flow hedging instruments.
[2] At December 31, 2019, derivative financial instruments, as reflected on the balance sheet, includes net unrealized gains on exchange traded futures and options contracts of $3.4 million, which include $0.1 million of net unrealized gains on derivative financial instruments designated as cash flow hedging instruments.
[3] At December 31, 2020, derivative financial instruments, as reflected on the balance sheet, includes net unrealized losses on exchange traded futures and options contracts of $9.3 million, none of which were designated as cash flow hedging instruments.