Assets Held for Sale (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Jul. 29, 2014	Dec. 31, 2013
Assets held for sale [Abstract]
Cash Consideration to Acquire Unproved Property	$ 100,000,000	$ 100,000,000
Leasehold Acres Consideration to Acquire Unproved Property	7,000	7,000
Cash Consideration to Acquire Proved and Unproved Property				345,000,000
Proceeds from Sale of Oil and Gas Property and Equipment	50,200,000	46,821,000	20,343,000
Gain (Loss) on Disposition of Oil and Gas Property	27,800,000
Assets Held-for-sale Reasonably Certain Period for Sale		1
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $23,697 and $7,390, respectively	23,935,000	23,935,000			19,072,000
Asset retirement obligation associated with oil and gas properties held for sale	$ 2,760,000	$ 2,760,000			$ 3,033,000