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DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Apr. 30, 2015
Sep. 30, 2014
Jun. 30, 2016
Dec. 31, 2015
Debt        
Short-term Bank Loans and Notes Payable     $ 159,908 $ 4,278
Unamortized Debt Issuance Expense     825  
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 June 30, 2016, the Company was in compliance with all of its covenants  
Short-term Bank Loans and Notes Payable     $ 135,000  
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 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, 2016, the Company was in compliance with all of its debt covenants  
Long-term Debt and Capital Lease Obligations, Including Current Maturities     $ 349,175  
Weighted Average [Member]        
Debt        
Debt Instrument, Term     19 years  
Minimum [Member] | Senior Notes [Member]        
Debt        
Debt Instrument, Term     10 years  
Maximum | Senior Notes [Member]        
Debt        
Debt Instrument, Term     30 years  
Senior Notes Series A [Member]        
Debt        
Debt Instrument, Maturity Date     Aug. 20, 2025  
Debt Instrument, Interest Rate, Stated Percentage     3.15%  
Debt Instrument, Face Amount     $ 100,000  
Senior Notes Series B [Member]        
Debt        
Debt Instrument, Maturity Date     Aug. 20, 2030  
Debt Instrument, Interest Rate, Stated Percentage     3.35%  
Debt Instrument, Face Amount     $ 100,000  
Senior Notes Series C [Member]        
Debt        
Debt Instrument, Maturity Date     Apr. 01, 2035  
Debt Instrument, Interest Rate, Stated Percentage     3.61%  
Debt Instrument, Face Amount     $ 50,000  
Senior Notes Series D [Member]        
Debt        
Debt Instrument, Maturity Date     Apr. 01, 2045  
Debt Instrument, Interest Rate, Stated Percentage     4.02%  
Debt Instrument, Face Amount     $ 100,000