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DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2017
Oct. 31, 2016
Apr. 30, 2015
Jun. 30, 2017
Dec. 31, 2016
Oct. 20, 2016
Apr. 01, 2015
Debt              
Line of Credit Facility, Expiration Date       Jun. 30, 2022      
Short-term Bank Loans and Notes Payable $ 1,953     $ 1,953 $ 1,889    
Revolving credit agreement              
Debt              
Borrowing capacity under the line of credit $ 400,000     $ 400,000      
Line of Credit Facility, Initiation Date Jun. 30, 2017            
Covenant compliance description       As of June 30, 2017, the Company was in compliance with all of its covenants      
Additional increase in borrowing capacity of the line of credit available at the entity's option $ 100,000     $ 100,000      
Debt Instrument, Term       5 years      
Senior Notes [Member]              
Debt              
Debt, Weighted Average Interest Rate 3.30%     3.30%      
Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Initiation Date     Apr. 01, 2015        
Debt Instrument, Face Amount             $ 350,000
Debt, Weighted Average Interest Rate             3.50%
Debt Instrument, Covenant Compliance       As of June 30, 2017, the Company was in compliance with all of its debt covenants      
Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Initiation Date   Oct. 20, 2016          
Debt Instrument, Face Amount           $ 350,000  
Debt, Weighted Average Interest Rate           3.10%  
Weighted Average [Member]              
Debt              
Debt Instrument, Term   18 years 19 years 18 years      
Minimum [Member] | Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Term     10 years        
Minimum [Member] | Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Term   12 years          
Maximum | Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Term     30 years        
Maximum | Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Term   25 years          
Senior Notes Series A [Member] | Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Maturity Date       Aug. 20, 2025      
Debt Instrument, Interest Rate, Stated Percentage 3.15%     3.15%      
Debt Instrument, Face Amount $ 100,000     $ 100,000      
Senior Notes Series A [Member] | Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Maturity Date       Oct. 20, 2028      
Debt Instrument, Interest Rate, Stated Percentage 2.75%     2.75%      
Debt Instrument, Face Amount $ 100,000     $ 100,000      
Senior Notes Series B [Member] | Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Maturity Date       Aug. 20, 2030      
Debt Instrument, Interest Rate, Stated Percentage 3.35%     3.35%      
Debt Instrument, Face Amount $ 100,000     $ 100,000      
Senior Notes Series B [Member] | Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Maturity Date       Oct. 20, 2033      
Debt Instrument, Interest Rate, Stated Percentage 3.03%     3.03%      
Debt Instrument, Face Amount $ 100,000     $ 100,000      
Senior Notes Series C [Member] | Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Maturity Date       Apr. 01, 2035      
Debt Instrument, Interest Rate, Stated Percentage 3.61%     3.61%      
Debt Instrument, Face Amount $ 50,000     $ 50,000      
Senior Notes Series C [Member] | Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Maturity Date       Oct. 20, 2037      
Debt Instrument, Interest Rate, Stated Percentage 3.27%     3.27%      
Debt Instrument, Face Amount $ 100,000     $ 100,000      
Senior Notes Series D [Member] | Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Maturity Date       Apr. 01, 2045      
Debt Instrument, Interest Rate, Stated Percentage 4.02%     4.02%      
Debt Instrument, Face Amount $ 100,000     $ 100,000      
Senior Notes Series D [Member] | Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Maturity Date       Oct. 20, 2041      
Debt Instrument, Interest Rate, Stated Percentage 3.52%     3.52%      
Debt Instrument, Face Amount $ 50,000     $ 50,000