SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Non-Cash Investing and Financing Activities:
Property and equipment accrued but unpaid	$ 245,692	$ 120,958
Leasehold improvements paid by landlord	0	350
Notes payable issued to vendor for the purchase of equipment	16,204	44,466
Right-of-use assets acquired in exchange for finance lease obligations	6,501	1,349
Deferred financing costs accrued but unpaid	853	0
Supplemental Data:
Cash interest paid	763,819	732,231
Income taxes paid (refunded), net	$ 6,247	$ 8,940