Annual report pursuant to Section 13 and 15(d)

Nature Of Operations And Accounting Policies (Schedule Of Deferred Gain Activity) (Details)

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Nature Of Operations And Accounting Policies (Schedule Of Deferred Gain Activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Amortization of deferred gains on sale leaseback transactions $ 0 $ (12,774) $ (15,035)  
Operating Expense        
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Amortization of deferred gains on sale leaseback transactions 0 (12,774) (15,035)  
Gains on Asset Dispositions and Impairments, Net        
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Amortization of deferred gains on sale of property, financed equipment sales (1,127) (11,591) (602)  
Amortization of deferred gains on sale of property, equipment sales to 50% or less owned companies (1,322) (1,372) (1,715)  
Sale Leaseback and Financed Equipment Sales        
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Balance at beginning of year 39,102 66,519 74,774  
Deferred gains arising from equipment sales 0 0 13,336  
Reclassification of deferred gains into historical cost on reacquired property and equipment 0 (3,052) (5,954)  
Balance at end of year 8,768 39,102 66,519  
Fifty Percent or Less Owned Subsidiaries        
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Balance at beginning of year 4,562 5,934 7,649  
Balance at end of year $ 3,240 $ 4,562 $ 5,934  
Sale Leaseback | Retained Earnings | Accounting Standards Update 2016-02        
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Impact of adoption of accounting principle       $ 29,207