Property, Plant & Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	$ 23,339
Accumulated Depreciation	(11,153)
Property, plant and equipment	12,186	216,909
Gas Gathering Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	0
Accumulated Depreciation	0
Property, plant and equipment	0	189,110
Computer equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	2,967
Accumulated Depreciation	(2,050)
Property, plant and equipment	917	892
Office equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	467
Accumulated Depreciation	(410)
Property, plant and equipment	57	41
Leasehold improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	471
Accumulated Depreciation	(360)
Property, plant and equipment	111	136
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	5,778
Accumulated Depreciation	0
Property, plant and equipment	5,778	22,359
Other [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	13,656
Accumulated Depreciation	(8,333)
Property, plant and equipment	$ 5,323	$ 4,371