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LONG-TERM DEBT - 2010 Notes (Details) - USD ($)
$ in Thousands
Apr. 07, 2017
Apr. 07, 2010
2010 Notes    
LONG-TERM DEBT    
Principal   $ 600,000
Borrowings $ 485,000  
2010 Notes | Weighted Average    
LONG-TERM DEBT    
Interest rate   6.59%
Maturity period   9 years 10 months 2 days
Series A    
LONG-TERM DEBT    
Interest rate 6.13%  
Repayments of non-current borrowings $ 115,000  
Series B    
LONG-TERM DEBT    
Principal   $ 360,000
Interest rate   6.67%
Series C    
LONG-TERM DEBT    
Principal   $ 125,000
Interest rate   6.77%