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LEASES - Summary of Maturity Analysis (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Disclosure of maturity analysis of operating lease payments [line items]  
Undiscounted operating lease payments to be received $ 55,222
2019  
Disclosure of maturity analysis of operating lease payments [line items]  
Undiscounted operating lease payments to be received 16,051
2020  
Disclosure of maturity analysis of operating lease payments [line items]  
Undiscounted operating lease payments to be received 14,097
2021  
Disclosure of maturity analysis of operating lease payments [line items]  
Undiscounted operating lease payments to be received 8,356
2022  
Disclosure of maturity analysis of operating lease payments [line items]  
Undiscounted operating lease payments to be received 6,500
2023 onwards  
Disclosure of maturity analysis of operating lease payments [line items]  
Undiscounted operating lease payments to be received $ 10,218