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Financing Agreement - Debt Instruments (Details) - USD ($)
1 Months Ended
Dec. 31, 2013
Dec. 31, 2010
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jul. 02, 2018
Dec. 31, 2017
Debt Instrument [Line Items]              
Long-term debt     $ 1,600,183,000 $ 1,862,631,000     $ 883,000,000
Interest rate at December 31     3.29% 3.64%     2.91%
Debt issuance costs     $ (4,135,000) $ (5,256,000)      
Total debt, finance lease obligations, and notes payable     1,693,509,000 1,962,570,000      
Less: current maturities     166,695,000 66,543,000      
Total long-term debt, finance lease obligations, and notes payable     $ 1,526,814,000 1,896,027,000      
Master Notes | Senior Unsecured Notes, 3.81 Percent, Due May 2018              
Debt Instrument [Line Items]              
Maturity date   May 31, 2018          
Issuance of senior notes   $ 25,000,000          
Master Notes | Senior Unsecured Notes, 4.60 Percent, Due May 2021              
Debt Instrument [Line Items]              
Maturity date   May 31, 2021          
Issuance of senior notes   $ 75,000,000          
Master Notes | Senior Unsecured Notes 3.13 Percent Due December 2020              
Debt Instrument [Line Items]              
Maturity date Dec. 31, 2020            
Issuance of senior notes $ 100,000,000            
Master Notes | Senior Unsecured Notes 4.23 Percent, Due July 2028              
Debt Instrument [Line Items]              
Maturity date Jul. 31, 2028            
Revolving loan facility              
Debt Instrument [Line Items]              
Average interest rate     1.10%        
Long-term debt     $ 75,183,000 187,631,000      
Senior Notes | Senior Unsecured Notes, 4.60 Percent, Due May 2021              
Debt Instrument [Line Items]              
Long-term debt     $ 75,000,000 75,000,000      
Interest rate, stated percentage     4.60%        
Senior Notes | Senior Unsecured Notes 3.13 Percent Due December 2020              
Debt Instrument [Line Items]              
Long-term debt     $ 100,000,000 100,000,000      
Interest rate, stated percentage     3.13%        
Senior Notes | Senior Unsecured Notes 4.23 Percent, Due July 2028              
Debt Instrument [Line Items]              
Long-term debt     $ 350,000,000 350,000,000 $ 350,000,000    
Interest rate, stated percentage     4.23%     4.23%  
Finance lease obligations              
Debt Instrument [Line Items]              
Interest rate at December 31     5.18%        
Finance lease obligations     $ 16,073,000 17,587,000      
Notes payable and other              
Debt Instrument [Line Items]              
Interest rate, stated percentage     4.23%        
Notes payable and other | Notes Payable 3.50 Percent Due June 2027              
Debt Instrument [Line Items]              
Long-term debt     $ 81,388,000 87,608,000      
Long-term Debt              
Debt Instrument [Line Items]              
Interest rate at period end     3.05%        
Long-term line of credit     $ 1,000,000,000 $ 1,150,000,000