SUPPLEMENTAL NON-CASH TRANSACTIONS - Summary of supplemental disclosure of cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Non-cash investing and financing activities excluded from the statement of cash flows:
Issued shares of common stock and preferred stock upon extinguishment of debt and modification of Series C Preferred Stock and Series D Preferred Stock	$ 0	$ 141,787
Deferred revenue realized upon purchase option exercise	0	11,700
Change in capital expenditures for drilling costs in accrued liabilities	(2,849)	6,211
Accrued cumulative paid in kind dividends on preferred stock	7,172	4,824
Change in asset retirement obligations	$ 5	$ 47