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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Effective interest rate 5.08%  
Capital lease obligations $ 21,175 $ 21,874
Debt issuance costs (3,147) (1,803)
Total debt, capital lease obligations, and notes payable 468,125 461,476
Less: current maturities 4,821 5,059
Total long-term debt, capital lease obligations, and notes payable $ 463,304 456,417
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 and other    
Debt Instrument [Line Items]    
Stated interest rate 3.50%  
Long-term debt $ 14,304 15,698
Revolving Credit Facility    
Debt Instrument [Line Items]    
Average interest rate at June 30, 2016 1.31%  
Revolving loan facility $ 135,793 225,707
Term loan    
Debt Instrument [Line Items]    
Average interest rate at June 30, 2016 1.59%  
Revolving loan facility $ 100,000 $ 0