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FINANCE LEASES (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Disclosure of finance lease and operating lease by lessee [line items]  
Minimum lease payments $ 121,450
Future finance charges (44,415)
Total Financial lease liabilities 77,035
Total minimum lease payments 77,035
Within one year  
Disclosure of finance lease and operating lease by lessee [line items]  
Minimum lease payments 8,328
Total minimum lease payments 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
Total minimum lease payments 27,208
Later than five years  
Disclosure of finance lease and operating lease by lessee [line items]  
Minimum lease payments 79,810
Total minimum lease payments $ 41,797