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Income Taxes Net deferred tax asset (liability) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]        
Valuation allowance adjustment $ 49,600   $ (45,600) $ 2,100,000
Deferred Tax Assets [Abstract]        
Deferred Tax Assets, Tax Deferred Expense, Other 237,836 $ 237,836 254,031  
Non-deductible reserves and other 155,488 155,488 191,097  
Inventory valuation reserves 476,673 476,673 599,763  
Net operating loss (NOL) carryforwards:        
Federal 367,302 367,302 515,568  
State 274,686 274,686 257,738  
Alternative minimum tax credits 44,161 44,161 34,812  
Energy credit and charitable contribution carryforward 28,669 28,669 27,858  
Deferred Tax Assets, Gross 1,584,815 1,584,815 1,880,867  
Deferred Tax Liabilities [Abstract]        
Capitalized items, including real estate basis differences, deducted for tax, net (39,220) (39,220) (31,584)  
Trademarks and tradenames (41,664) (41,664) (46,362)  
Deferred Tax Liabilities, Gross (80,884) (80,884) (77,946)  
Valuation allowance (109,052) (109,052) (82,253)  
Net deferred tax asset (liability) $ 1,394,879 $ 1,394,879 $ 1,720,668  
Minimum [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, expiration dates   Jan. 01, 2028    
Minimum [Member] | 2016 to 2020 [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, expiration dates   Jan. 01, 2016    
Minimum [Member] | 2021 to 2025 [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, expiration dates   Jan. 01, 2021    
Maximum [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, expiration dates   Jan. 01, 2032    
Maximum [Member] | 2016 to 2020 [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, expiration dates   Jan. 01, 2020    
Maximum [Member] | 2021 to 2025 [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, expiration dates   Jan. 01, 2025