Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Oil and natural gas properties:
Subject to depletion	$ 2,224,830	$ 1,627,367
Not subject to depletion	1,210,684	618,794
Oil and natural gas properties, successful efforts method	3,435,514	2,246,161
Accumulated depreciation, depletion and impairment	(450,387)	(290,186)
Total oil and natural gas properties, net	2,985,127	1,955,975
Other property, plant and equipment	59,585	37,253
Less accumulated depreciation	(12,144)	(7,475)
Other property, plant and equipment, net	47,441	29,778
Total property, plant and equipment, net	3,032,568	1,985,753
Incurred in 2016
Oil and natural gas properties:
Not subject to depletion	731,072	0
Incurred in 2015
Oil and natural gas properties:
Not subject to depletion	36,833	118,101
Incurred in 2014 and prior
Oil and natural gas properties:
Not subject to depletion	$ 442,779	$ 500,693