Discontinued Operations and Disposal Groups (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Balance Sheet - Discontinued Operations
Assets held for sale - non-current	$ 2,874,000		$ 2,874,000
Statement of Operations - Discontinued Operations
Loss from discontinued operations, net of tax	0	(719,000)
Supplemental Cash Flow Information
Capital expenditures	(176,111,000)	(135,758,000)
Change in accounts payable related to purchases of properties and equipment	(35,836,000)	(10,978,000)
PDCM Divestiture
Supplemental Cash Flow Information
Capital expenditures	(10,380,000)
Change in accounts payable related to purchases of properties and equipment	(1,536,000)
Assets Held-for-sale | Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Properties and equipment	2,900,000
Discontinued Operations
Statement of Operations - Discontinued Operations
Crude oil, natural gas and NGL sales		9,831,000
Commodity price risk management gain (loss), net		(2,248,000)
Well operations, pipeline income and other		22,000
Total revenues		7,605,000
Production Costs		3,121,000
Impairment of Natural Gas and Crude Oil Properties		69,000
Depreciation, depletion and amortization		3,750,000
Other		1,148,000
Loss on sale of properties and equipment		146,000
Total costs, expenses and other		8,234,000
Interest Expense		(647,000)
Interest income		64,000
Income from discontinued operations		(1,212,000)
Provision for income taxes		493,000
Loss from discontinued operations, net of tax		$ (719,000)