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Change in Accounting Principle; Inventories (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statement of Income and Comprehensive Income        
Cost of sales $ (1,129,921) $ (569,961)    
Gross profit 301,404 185,246    
Income from operations 160,908 [1] 106,000    
Income before taxes 140,117 [1] 96,749    
Provision for income taxes (50,031) (34,455)    
Net income 90,086 62,294    
Comprehensive income 91,907 65,052    
Net income per common share:        
Basic $ 0.92 $ 0.65    
Diluted $ 0.92 $ 0.64    
Consolidated Balance Sheet        
Inventories 607,306   594,291  
Deferred income tax assets 31,985   47,616  
Retained earnings 1,067,661   1,019,101  
Consolidated Statement of Cash Flows        
Net income 90,086 62,294    
Deferred income tax provision (benefit) 15,645 196    
Inventories (13,035) (4,168)    
As Previously Reported (under LIFO)
        
Consolidated Statement of Income and Comprehensive Income        
Cost of sales   (572,715) [2]    
Gross profit   182,492 [2]    
Income from operations   103,246 [2]    
Income before taxes   93,995 [2]    
Provision for income taxes   (33,382) [2]    
Net income   60,613 [2]    
Comprehensive income   63,371 [2]    
Net income per common share:        
Basic   $ 0.63 [2]    
Diluted   $ 0.62 [2]    
Consolidated Balance Sheet        
Inventories     522,523  
Deferred income tax assets     75,579  
Retained earnings     975,296  
Consolidated Statement of Cash Flows        
Net income   60,613 [2]    
Deferred income tax provision (benefit)   (877)    
Inventories   (1,414)    
Change in Accounting Method for Inventory Valuation | Effect of Change in Accounting Principle
        
Consolidated Statement of Income and Comprehensive Income        
Cost of sales   2,754    
Gross profit   2,754    
Income from operations   2,754    
Income before taxes   2,754    
Provision for income taxes   (1,073)    
Net income 1,400 1,681    
Comprehensive income   1,681    
Net income per common share:        
Basic   $ 0.02    
Diluted   $ 0.02    
Consolidated Balance Sheet        
Inventories 69,500   71,768  
Deferred income tax assets     (27,963)  
Retained earnings     43,805 38,800
Consolidated Statement of Cash Flows        
Net income 1,400 1,681    
Deferred income tax provision (benefit)   1,073    
Inventories   $ (2,754)    
[1] On October 25, 2013, we acquired Boise. Our first quarter 2014 results include Boise for the full period.
[2] Certain amounts in prior periods' consolidated financial statements have been reclassified to conform with the current period presentation.