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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, 2019
Dec. 31, 2018
Oct. 20, 2016
Apr. 01, 2015
Debt              
Borrowings on Line of Credit       $ 30,110 $ 111    
Revolving credit agreement              
Debt              
Borrowing capacity under the line of credit       $ 400,000      
Line of Credit Facility, Initiation Date Jun. 30, 2017            
Line of Credit Facility, Expiration Date       Jun. 30, 2022      
Covenant compliance description       As of June 30, 2019, the Company was in compliance with all of its covenants      
Borrowings on Line of Credit       $ 30,000      
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%      
Debt Instrument, Covenant Compliance       As of June 30, 2019, the Company was in compliance with all of its debt covenants      
Senior Notes 2015 [Member]              
Debt              
Debt Instrument, Initiation Date     Apr. 01, 2015        
Debt Instrument, Face Amount             $ 350,000
Senior Notes 2016 [Member]              
Debt              
Debt Instrument, Initiation Date   Oct. 20, 2016          
Debt Instrument, Face Amount           $ 350,000  
Weighted Average [Member]              
Debt              
Debt Instrument, Term       15 years      
Private Placement [Member]              
Debt              
Debt Instrument, Term       5 years      
Debt Instrument, Covenant Compliance       As of June 30, 2019, the Company was in compliance with all of its covenants      
Debt Instrument, Unused Borrowing Capacity, Amount       $ 700,000      
Minimum [Member]              
Debt              
Lessee, Operating Lease, Renewal Term       1 year      
Minimum [Member] | Senior Notes [Member]              
Debt              
Debt Instrument, Maturity Date       Aug. 20, 2025      
Debt Instrument, Interest Rate, Stated Percentage       2.75%      
Debt Instrument, Face Amount       $ 50,000      
Maximum              
Debt              
Lessee, Operating Lease, Renewal Term       11 years      
Maximum | Senior Notes [Member]              
Debt              
Debt Instrument, Maturity Date       Apr. 01, 2045      
Debt Instrument, Interest Rate, Stated Percentage       4.02%      
Debt Instrument, Face Amount       $ 100,000      
Maximum | Private Placement [Member]              
Debt              
Debt Instrument, Term       15 years