Property, Plant & Equipment (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	$ 331,913,000
Accumulated Depreciation	(115,004,000)
Property, plant and equipment	216,909,000	212,372,000
Gas Gathering Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	294,356,000
Accumulated Depreciation	(105,246,000)
Property, plant and equipment	189,110,000	183,567,000
Computer equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	2,726,000
Accumulated Depreciation	(1,834,000)
Property, plant and equipment	892,000	1,000,000
Office equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	431,000
Accumulated Depreciation	(390,000)
Property, plant and equipment	41,000	80,000
Leasehold improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	450,000
Accumulated Depreciation	(314,000)
Property, plant and equipment	136,000	199,000
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	22,359,000
Accumulated Depreciation	0
Property, plant and equipment	22,359,000	22,359,000
Other [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	11,591,000
Accumulated Depreciation	(7,220,000)
Property, plant and equipment	$ 4,371,000	$ 5,167,000