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DEBT (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Unsecured lines of credit
Dec. 31, 2012
Unsecured lines of credit
Jan. 31, 2013
Revolving credit facility
Dec. 31, 2013
Revolving credit facility
Jan. 31, 2012
Revolving credit facility
Jan. 31, 2014
Revolving credit facility
Subsequent event
Dec. 31, 2013
Notes payable 0.61% - 25.5%, due in monthly and annual installments through 2027
Dec. 31, 2012
Notes payable 0.61% - 25.5%, due in monthly and annual installments through 2027
Dec. 31, 2012
Senior unsecured notes 5.4%, due in 2013
Dec. 31, 2013
Senior unsecured notes 2.3%, due in 2015
Dec. 31, 2012
Senior unsecured notes 2.3%, due in 2015
Dec. 31, 2013
Senior unsecured notes 6.0% due in 2016
Dec. 31, 2012
Senior unsecured notes 6.0% due in 2016
Dec. 31, 2013
Senior unsecured notes 6.0%, due in 2018
Dec. 31, 2012
Senior unsecured notes 6.0%, due in 2018
Dec. 31, 2013
Senior unsecured notes 3.8%, due in 2020
Dec. 31, 2012
Senior unsecured notes 3.8%, due in 2020
Dec. 31, 2013
Senior unsecured notes 3.2%, due in 2022
Dec. 31, 2012
Senior unsecured notes 3.2%, due in 2022
Dec. 31, 2013
Senior unsecured notes 3.4%, due in 2024
Dec. 31, 2012
Senior unsecured notes 3.4%, due in 2024
Dec. 31, 2013
Capital lease obligations
Dec. 31, 2012
Capital lease obligations
Debt                                                  
Average borrowings     $ 61,400,000 $ 110,300,000                                          
Average annual interest rate on short-term notes payable (as a percent) 3.10% 2.10%                                              
Revolving credit, maximum borrowing facility             300,000,000                                    
Extension of maturity date         1 year     1 year                                  
Amount of permitted receivables transactions prior to amendment               100,000,000                                  
Amount of permitted receivables transactions               150,000,000                                  
Reduction in cost of committed funds               0.125%                                  
Reduction in cost of uncommitted funds               0.025%                                  
Amount outstanding under line of credit           110,000,000                                      
Credit facility interest and fees           1,000,000                                      
Long-term obligations including current maturities 356,139,000 382,348,000             3,230,000 4,410,000 25,000,000 16,000,000 16,000,000 50,000,000 50,000,000 75,000,000 75,000,000 84,000,000 84,000,000 75,000,000 75,000,000 50,000,000 50,000,000 2,909,000 2,938,000
Current maturities of long-term obligations (1,325,000) (29,488,000)                                              
Total long-term obligations 354,814,000 352,860,000                                              
Interest rate on notes payable, low end of range (as a percent)                 0.61% 0.61%                              
Interest rate on notes payable, high end of range (as a percent)                 25.50% 25.50%                              
Interest rate on senior unsecured notes (as a percent)                     5.40% 2.30% 2.30% 6.00% 6.00% 6.00% 6.00% 3.80% 3.80% 3.20% 3.20% 3.40% 3.40%    
Aggregate long-term maturities, excluding capital lease obligations                                                  
2014 801,000                                                
2015 16,055,000                                                
2016 50,056,000                                                
2017 56,000                                                
2018 75,119,000                                                
Thereafter $ 211,143,000