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LONG-TERM DEBT - Borrowings redemption prices (Details) - Senior unsecured notes - due May 15, 2025
12 Months Ended
Dec. 31, 2019
Long Term Debt  
Borrowings Redemption Price Percentage 100.00%
2020  
Long Term Debt  
Borrowings Redemption Price Percentage 104.78%
2021  
Long Term Debt  
Borrowings Redemption Price Percentage 103.19%
2022  
Long Term Debt  
Borrowings Redemption Price Percentage 101.59%
2023 and thereafter  
Long Term Debt  
Borrowings Redemption Price Percentage 100.00%