Property, Plant and Equipment Joint Venture Activity (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2014	Dec. 31, 2012 acre	Jun. 30, 2012
Noble JV [Member]
Significant Acquisitions and Disposals [Line Items]
drill carry remaining		$ 1,816,095
Drilling commitment carry				1,884,000
Maximum Drilling Commitment Carry	400,000
Gas and Oil Acreage, Unproved, Net			696,000
Hess [Member]
Significant Acquisitions and Disposals [Line Items]
drill carry remaining		$ 175,582	$ 335,000
Gas and Oil Acreage, Unproved, Net			144,000