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Derivative Financial Instruments (Schedule Of Fair Values Of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 29,785 $ 22,882
Liability Derivatives, Fair Value 20,846 8,245
Margin deposit asset 8,800 7,700
Net unrealized gains (losses) on cash flow hedges 4,200 (2,300)
Derivative Financial Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value [2] 29,785 [1] 22,882 [3]
Accrued and Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 20,831 $ 8,245
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value $ 15  
[1] Balance at September 30, 2016 includes $4.2 million of net unrealized gains on derivative financial instruments designated as cash flow hedging instruments.
[2] Derivative financial instruments as reflected on the consolidated balance sheets are net of related margin deposit assets of $8.8 million and $7.7 million at September 30, 2016 and December 31, 2015, respectively.
[3] Balance at December 31, 2015 includes $2.3 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.