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LONG-TERM DEBT - 2020 Notes (Details)
$ in Thousands
Apr. 07, 2020
USD ($)
2020 Notes  
LONG-TERM DEBT  
Principal $ 200,000
Series A  
LONG-TERM DEBT  
Principal $ 100,000
Interest rate 2.78%
Series B  
LONG-TERM DEBT  
Principal $ 100,000
Interest rate 2.88%
Weighted Average | 2020 Notes  
LONG-TERM DEBT  
Maturity period 11 years
Interest rate 2.83%