Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL CASH FLOWS INFORMATION (Details)

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SUPPLEMENTAL CASH FLOWS INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental cash flows disclosures      
Interest paid $ 5,068 $ 3,966 $ 18,249
Income taxes paid 0 0 3
Supplemental disclosure of non‑cash investing and financing activities      
Capital expenditures included in accounts payable and accrued liabilities 137,647 33,850 3,176
Conversion of preferred stock to common stock at Initial Public Offering 0 162,511 0
Non-cash purchases of property and equipment $ 204,512 $ 0 $ 0