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LONG-TERM DEBT - 2016 Notes (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
2016 Notes  
LONG-TERM DEBT  
Principal $ 350,000
2016 Notes | Weighted Average  
LONG-TERM DEBT  
Interest rate 4.77%
Maturity period 9 years 5 months 5 days
Series A  
LONG-TERM DEBT  
Principal $ 100,000
Interest rate 4.54%
Series B  
LONG-TERM DEBT  
Principal $ 200,000
Interest rate 4.84%
Series C  
LONG-TERM DEBT  
Principal $ 50,000
Interest rate 4.94%