Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Wells and production facilities	$ 28,874	$ 28,874
Proved properties	386,196	386,196
Warehouse inventory	25,429	25,429
Work in progress	63,958	62,208
Oilfield assets	504,457	502,707
Accumulated depletion	(78,976)	(74,476)
Oilfield assets, net	425,481	428,231
Unproved Oil and Gas Property, Successful Effort Method	8,240	8,240
Oil and gas properties, net	433,721	436,471
Other property and equipment	1,866	1,590
Accumulated depreciation	(911)	(838)
Other property and equipment, net	955	752
Total property, plant and equipment, net	$ 434,676	$ 437,223