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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Effective interest rate 5.22%  
Capital lease obligations $ 18,547 $ 19,889
Debt issuance costs (1,800) (2,261)
Total debt, capital lease obligations, and notes payable 1,112,622 913,012
Less: current maturities 40,120 47,746
Total long-term debt, capital lease obligations, and notes payable $ 1,072,502 865,266
Revolving Credit Facility    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 2.98%  
Senior Notes | Senior Unsecured Notes 3.81% Due May 2018    
Debt Instrument [Line Items]    
Stated interest rate 3.81%  
Long-term debt $ 0 25,000
Senior Notes | Senior Unsecured Notes 4.60% Due May 2021    
Debt Instrument [Line Items]    
Stated interest rate 4.60%  
Long-term debt $ 75,000 75,000
Senior Notes | Senior Unsecured Notes 3.13% Due December 2020    
Debt Instrument [Line Items]    
Stated interest rate 3.13%  
Long-term debt $ 100,000 100,000
Notes payable and other    
Debt Instrument [Line Items]    
Stated interest rate 3.50%  
Long-term debt $ 10,875 12,384
Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving loan facility $ 240,000 3,000
Term loan    
Debt Instrument [Line Items]    
Average interest rate at June 30, 2018 3.22%  
Revolving loan facility $ 670,000 $ 680,000