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Financing Agreement Debt Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Long-term debt $ 425,707 $ 200,000 $ 280,500
Total debt, capital lease obligations, and notes payable 463,279 226,148  
Less: current maturities 5,059 2,528  
Total long-term debt, capital lease obligations, and notes payable $ 458,220 223,620  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Average interest rate 1.07%    
Long-term debt $ 225,707 0  
Senior Notes | Senior Unsecured Notes, 3.81 Percent, Due May 2018      
Debt Instrument [Line Items]      
Average interest rate 3.81%    
Long-term debt $ 25,000 25,000  
Senior Notes | Senior Unsecured Notes, 4.60 Percent, Due May 2021      
Debt Instrument [Line Items]      
Average interest rate 4.60%    
Long-term debt $ 75,000 75,000  
Senior Notes | Senior Unsecured Notes 3.13 Percent Due December 2020      
Debt Instrument [Line Items]      
Average interest rate 3.13%    
Long-term debt $ 100,000 100,000  
Capital lease obligations      
Debt Instrument [Line Items]      
Average interest rate 5.00%    
Capital lease obligations $ 21,874 26,148  
Notes payable | Notes Payable 3.50 Percent Due June 2027      
Debt Instrument [Line Items]      
Average interest rate 3.50%    
Long-term debt $ 15,698 $ 0