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LONG-TERM DEBT - 2017 Notes (Details)
$ in Thousands
May 05, 2017
USD ($)
2017 Notes  
LONG-TERM DEBT  
Principal $ 300,000
2017 Notes | Weighted Average  
LONG-TERM DEBT  
Interest rate 4.67%
Maturity period 10 years 10 months 24 days
Series A  
LONG-TERM DEBT  
Principal $ 40,000
Interest rate 4.42%
Series B  
LONG-TERM DEBT  
Principal $ 100,000
Interest rate 4.64%
Series C  
LONG-TERM DEBT  
Principal $ 150,000
Interest rate 4.74%
Series D  
LONG-TERM DEBT  
Principal $ 10,000
Interest rate 4.89%