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FINANCE LEASES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments $ 113,122 $ 121,450
Future finance charges (39,294) (44,415)
Total Financial lease liabilities 73,828 77,035
Total minimum lease payments 73,828 77,035
Within one year    
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments 8,328 8,328
Total minimum lease payments 8,030 8,030
Later than one year but not later than five years    
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments 33,312 33,312
Total minimum lease payments 27,208 27,208
Later than five years    
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments 71,482 79,810
Total minimum lease payments $ 38,590 $ 41,797