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DEBT (Details) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Unsecured lines of credit
Dec. 31, 2011
Unsecured lines of credit
Jan. 31, 2012
Revolving credit facility
Dec. 31, 2011
Revolving credit facility
Jan. 31, 2013
Revolving credit facility
Subsequent event
Dec. 31, 2012
Notes payable 2.1% - 12.6%, due in monthly and annual installments through 2014
Dec. 31, 2011
Notes payable 2.1% - 12.6%, due in monthly and annual installments through 2014
Dec. 31, 2012
Senior unsecured notes 5.4%, due in 2013
Dec. 31, 2011
Senior unsecured notes 5.4%, due in 2013
Dec. 31, 2012
Senior unsecured notes 2.3%, due in 2015
Dec. 31, 2011
Senior unsecured notes 2.3%, due in 2015
Dec. 31, 2012
Senior unsecured notes 6.0% due in 2016
Dec. 31, 2011
Senior unsecured notes 6.0% due in 2016
Dec. 31, 2012
Senior unsecured notes 6.0%, due in 2018
Dec. 31, 2011
Senior unsecured notes 6.0%, due in 2018
Dec. 31, 2012
Senior unsecured notes 3.8%, due in 2020
Dec. 31, 2011
Senior unsecured notes 3.8%, due in 2020
Dec. 31, 2012
Senior unsecured notes 3.2%, due in 2022
Dec. 31, 2012
Senior unsecured notes 3.4%, due in 2024
Dec. 31, 2012
Capital lease obligations
Dec. 31, 2011
Capital lease obligations
Debt                                              
Average borrowings     $ 110,300,000 $ 112,800,000                                      
Average annual interest rate on short-term notes payable (as a percent) 2.10% 0.70%                                          
Revolving credit, maximum borrowing facility         300,000,000 200,000,000                                  
Extension of maturity date             1 year                                
Revolving credit facility, initial amount borrowed         185,000,000                                    
Repayment of outstanding obligations         165,000,000                                    
Long-term obligations including current maturities 382,348,000 259,026,000           4,410,000 5,654,000 25,000,000 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 50,000,000 2,938,000 3,372,000
Current maturities of long-term obligations (29,488,000) (4,116,000)                                          
Total long-term obligations 352,860,000 254,910,000                                          
Interest rate on notes payable, low end of range (as a percent)               2.10% 2.10%                            
Interest rate on notes payable, high end of range (as a percent)               12.60% 12.60%                            
Interest rate on senior unsecured notes (as a percent)                   5.40% 5.40% 2.30% 2.30% 6.00% 6.00% 6.00% 6.00% 3.80% 3.80% 3.20% 3.40%    
Aggregate long-term maturities, excluding capital lease obligations                                              
2013 29,068,000                                            
2014 342,000                                            
2015 16,000,000                                            
2016 50,000,000                                            
2017 0                                            
Thereafter $ 284,000,000