Summary of Significant Accounting Policies - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Accrued drilling, completion and facility costs	$ 25,667		$ 69,830
Accrued lease operating, gathering, transportation and processing expenses	8,046		6,970
Accrued general and administrative expenses	6,612		8,774
Accrued interest payable	6,832		6,758
Accrued merger transaction expenses	0		550
Trade payables	17,488		31,057
Operating lease liability	1,287	$ 300	0
Other	5,706		7,440
Total accounts payable and accrued liabilities	$ 71,638		$ 131,379