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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Effective interest rate 5.03%  
Capital lease obligations $ 19,868 $ 19,306
Debt issuance costs (2,722) (3,156)
Total debt, capital lease obligations, and notes payable 1,067,797 1,141,910
Less: current maturities 2,831 3,847
Total long-term debt, capital lease obligations, and notes payable $ 1,064,966 1,138,063
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 $ 12,383 13,618
Revolving Credit Facility    
Debt Instrument [Line Items]    
Average interest rate at June 30, 2017 2.15%  
Revolving loan facility $ 118,268 172,142
Term loan    
Debt Instrument [Line Items]    
Average interest rate at June 30, 2017 2.44%  
Revolving loan facility $ 720,000 $ 740,000