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DEBT AND FINANCING ARRANGEMENTS - Debt maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Scheduled debt maturity    
2021 $ 0  
2022 0  
2023 0  
2024 0  
2025 0  
After 2025 1,325,000  
Unamortized discount and debt issuance expenses (15,305)  
Total senior notes and notes payable $ 1,309,695 $ 1,808,157