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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Effective interest rate 5.03%  
Capital lease obligations $ 19,205,000 $ 19,306,000
Debt issuance costs (2,952,000) (3,156,000)
Total debt, capital lease obligations, and notes payable 1,177,741,000 1,141,910,000
Less: current maturities 2,888,000 3,847,000
Total long-term debt, capital lease obligations, and notes payable $ 1,174,853,000 1,138,063,000
Senior Notes | Senior Unsecured Notes 3.81% Due May 2018    
Debt Instrument [Line Items]    
Stated interest rate 3.81%  
Long-term debt $ 25,000,000 25,000,000
Senior Notes | Senior Unsecured Notes 4.60% Due May 2021    
Debt Instrument [Line Items]    
Stated interest rate 4.60%  
Long-term debt $ 75,000,000 75,000,000
Senior Notes | Senior Unsecured Notes 3.13% Due December 2020    
Debt Instrument [Line Items]    
Stated interest rate 3.13%  
Long-term debt $ 100,000,000 100,000,000
Notes payable and other    
Debt Instrument [Line Items]    
Stated interest rate 3.50%  
Long-term debt $ 12,383,000 13,618,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Average interest rate at March 31, 2017 1.88%  
Revolving loan facility $ 219,105,000 172,142,000
Term loan    
Debt Instrument [Line Items]    
Average interest rate at March 31, 2017 2.23%  
Revolving loan facility $ 730,000,000 $ 740,000,000