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CAPITAL LEASE OBLIGATION, Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Current portion of obligations under capital leases $ 69,491 $ 67,793
Obligations under capital leases - long-term portion 1,071,661 1,104,258
Capital Lease Obligations $ 1,141,152 $ 1,172,051