Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Oil and natural gas properties
Evaluated (subject to amortization)	$ 2,122,174	$ 1,617,913
Total unproved and unevaluated	387,504	264,419
Total oil and natural gas properties	2,509,678	1,882,332
Accumulated depletion	(1,574,040)	(596,218)
Net oil and natural gas properties	935,638	1,286,114
Other property and equipment
Other property and equipment	86,387	43,472
Accumulated depreciation	(9,619)	(7,514)
Net other property and equipment	76,768	35,958
Net property and equipment	1,012,406	1,322,072
Midstream support equipment and facilities
Other property and equipment
Other property and equipment	78,564	38,135
Furniture, fixtures and other equipment
Other property and equipment
Other property and equipment	2,918	2,633
Software
Other property and equipment
Other property and equipment	2,193	1,733
Land
Other property and equipment
Other property and equipment	1,539	0
Leasehold improvements
Other property and equipment
Other property and equipment	$ 1,173	$ 971