Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accounts payable	$ 101,231	$ 217,578
Revenues payable	162,762	145,816
Accrued capital expenditures	32,493	61,950
Accrued interest	45,033	36,295
Accrued severance	3,846	28,803
Total accounts payable and accrued liabilities	$ 345,365	$ 490,442