Oil and Natural Gas Properties - Schedule of Net Changes in Capitalized Exploratory Well Costs (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net changes in capitalized exploratory well costs (excluding any related leasehold costs)
Beginning of period		$ 1,727,181	$ 1,186,464	$ 777,823
Amounts charged to expense	[1]	(1,489,960)	(177,361)	(165,459)
End of period		836,747	1,727,181	1,186,464
Exploration well costs
Net changes in capitalized exploratory well costs (excluding any related leasehold costs)
Beginning of period		1,572,090
Additions to capitalized exploration		499,985	630,395	522,892
End of period		582,115	1,572,090
Capitalized interest
Net changes in capitalized exploratory well costs (excluding any related leasehold costs)
Beginning of period		155,091
Additions to capitalized exploration		99,541	87,683	$ 51,208
End of period		$ 254,632	$ 155,091

[1] Amounts represent dry hole costs related to exploratory wells which did not encounter commercial hydrocarbons or where it was determined that sufficient progress was not being made.