Subsequent Event (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended	4 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2016	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Proceeds from the sale of non-oil and gas properties		$ 1,100		$ 4,022	$ 0	$ 0
Monetization of derivative contracts				$ 14,370	$ 4,610	$ 152
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from the sale of non-oil and gas properties			$ 10,600
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issuance (in shares)	28.8
Proceeds from sale of equity	$ 65,300