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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Effective interest rate 5.06%  
Capital lease obligations $ 22,057  
Debt issuance costs (1,682) $ (1,803)
Total debt, capital lease obligations, and notes payable 532,404 461,476
Less: current maturities 4,895 5,059
Total long-term debt, capital lease obligations, and notes payable $ 527,509 456,417
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
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Capital lease obligations   21,874
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 March 31, 2016 1.10%  
Revolving loan facility $ 297,725 $ 225,707