Completion of Acquisition and Disposition of Assets (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014
Business Combination Consideration Transferred [Abstract]
Adjusted Cash Payment	$ 890,800,000
Assets [Abstract]
Joint Interest Billing and Other Receivables SWEPI Properties	(4,182,000)
Other Current Assets [Abstract]
Acquired Condensate Inventory	819,000
Acquired Yard Inventory	3,515,000
Subtotal Other current assets	4,334,000
Proven oil and gas properties	1,033,960,000
Property Plant And Equipment [Abstract]
Divested Gathering Systems Pennsylvania Properties	(98,580,000)
Acquired Other Fixed Assets SWEPI Properties	869,000
Divested Other Fixed Assets Pennsylvania Properties	(50,000)
Subtotal Property Plant And Equipment	(97,761,000)
Total assets acquired, net of divest assets	936,351,000
Current Liabilities [Abstract]
Current Liabilities Pennsylvania Properties	8,657,000
Current Liabilities SWEPI Properties	(601,000)
Subtotal Current liabilities	8,056,000
Other long term obligations [Abstract]
Acquired Asset Retirement Obligation SWEPI Properties	53,270,000
Divested Asset Retirement Obligation Pennsylvania Properties	(15,760,000)
Subtotal Other Long Term Obligations	37,510,000
Total Liabilities Net	$ 45,566,000