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Derivative Financial Instruments (Schedule Of Fair Values Of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 14,695 $ 14,515
Liability Derivatives, Fair Value 8,325 7,771
Derivative Financial Instruments, Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 14,687 14,515 [1]
Net unrealized gains on exchange traded futures and options contracts included in balance sheet   3,400
Derivative Financial Instruments, Assets [Member] | Cash Flow Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Net unrealized gains on exchange traded futures and options contracts included in balance sheet   100
Derivative Financial Instruments, Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 8,325 [2] $ 7,771
Net unrealized losses on exchange traded futures and options contracts 9,600  
Derivative Financial Instruments, Liabilities [Member] | Cash Flow Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Net unrealized losses on exchange traded futures and options contracts 2,500  
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 8  
[1] 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.
[2] At September 30, 2020, derivative financial instruments, as reflected on the balance sheet, includes net unrealized losses on exchange traded futures and options contracts of $9.6 million, which included $2.5 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.