Commitments (Details) (USD $)	12 Months Ended								78 Months Ended	138 Months Ended	12 Months Ended					24 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2011 Drilling Rig Leasing Contracts	Dec. 31, 2011 Gas gathering through-put commitments	Dec. 31, 2011 Office Space Leases	Dec. 31, 2011 Hydraulic fracturing services contract	Dec. 31, 2011 Other miscellaneous contracts and leases	Dec. 31, 2013 Asset under Construction	Dec. 31, 2011 Crude oil	Dec. 31, 2011 Natural gas
Commitments and Contingencies
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume																	9,000,000	1,766,000,000,000
Commitment amount	$ 100,635,000	$ 97,401,000	$ 108,629,000	$ 99,633,000	$ 131,021,000				$ 561,642,000	$ 1,098,961,000	$ 143,041,000	$ 893,582,000	$ 37,419,000	$ 19,200,000	$ 5,720,000	$ 75,000,000
Operating Leases, Rent Expense						3,700,000	2,700,000
Operating Leases, Rent Expense, Sublease Rentals						0	0	185,000
Operating Leases, Rent Expense, Net								$ 2,300,000