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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Effective interest rate 5.05%  
Capital lease obligations $ 23,136 $ 26,148
Total debt, capital lease obligations, and notes payable 403,482 226,148
Less: current maturities 4,948 2,528
Total long-term debt, capital lease obligations, and notes payable $ 398,534 223,620
Senior Notes | Senior Unsecured Notes 3.81% Due May 2018    
Debt Instrument [Line Items]    
Stated interest rate 3.81%  
Long-term Debt $ 25,000 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    
Debt Instrument [Line Items]    
Stated interest rate 3.50%  
Long-term Debt $ 15,943 0
Revolving Credit Facility    
Debt Instrument [Line Items]    
Average interest rate at June 30, 2015 0.98%  
Long-term Line of Credit $ 164,403 $ 0