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DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2016
Apr. 30, 2015
Sep. 30, 2014
Sep. 30, 2016
Oct. 20, 2016
Dec. 31, 2015
Apr. 01, 2015
Debt              
Short-term Bank Loans and Notes Payable       $ 183,827   $ 4,278  
Unamortized Debt Issuance Expense       811      
Revolving credit agreement              
Debt              
Borrowing capacity under the line of credit       $ 400,000      
Line of Credit Facility, Initiation Date     Sep. 12, 2014        
Covenant compliance description       As of September 30, 2016, the Company was in compliance with all of its covenants      
Short-term Bank Loans and Notes Payable       $ 155,000      
Additional increase in borrowing capacity of the line of credit available at the entity's option       $ 100,000      
Debt Instrument, Term       5 years      
Senior Notes [Member]              
Debt              
Debt, Weighted Average Interest Rate       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 September 30, 2016, the Company was in compliance with all of its debt covenants      
Long-term Debt and Capital Lease Obligations, Including Current Maturities       $ 349,189      
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]              
Debt              
Debt Instrument, Maturity Date Oct. 20, 2028     Aug. 20, 2025      
Debt Instrument, Interest Rate, Stated Percentage       3.15% 2.75%    
Debt Instrument, Face Amount       $ 100,000 $ 100,000    
Senior Notes Series B [Member]              
Debt              
Debt Instrument, Maturity Date Oct. 20, 2033     Aug. 20, 2030      
Debt Instrument, Interest Rate, Stated Percentage       3.35% 3.03%    
Debt Instrument, Face Amount       $ 100,000 $ 100,000    
Senior Notes Series C [Member]              
Debt              
Debt Instrument, Maturity Date Oct. 20, 2037     Apr. 01, 2035      
Debt Instrument, Interest Rate, Stated Percentage       3.61% 3.27%    
Debt Instrument, Face Amount       $ 50,000 $ 100,000    
Senior Notes Series D [Member]              
Debt              
Debt Instrument, Maturity Date Oct. 20, 2041     Apr. 01, 2045      
Debt Instrument, Interest Rate, Stated Percentage       4.02% 3.52%    
Debt Instrument, Face Amount       $ 100,000 $ 50,000