Leases - Schedule of Right-of-Use Asset and Liability, Adjusted for Initial Direct Costs and Incentives (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Operating leases:
Operating lease assets	$ 6,722	$ 6,855
Current portion of operating lease liabilities	$ 1,927	$ 1,793
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current portion of operating lease liabilities	Current portion of operating lease liabilities
Operating lease liabilities	$ 18,015	$ 18,554
Total operating lease liabilities	19,942	20,347
Finance leases:
Proved property	124,299	124,299
Other current liabilities	$ 23,002	$ 21,804
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Other long-term liabilities	$ 33,966	$ 40,222
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Total finance lease liabilities	$ 56,968	$ 62,026