DHS Drilling	6 Months Ended
Jun. 30, 2011
DHS Drilling [Abstract]
DHS Drilling	(5) DHS Drilling The carrying value of DHS’s drilling rigs and related equipment is assessed for impairment whenever circumstances indicate an impairment may exist. No such impairment provisions were recorded during the three and six months ended June 30, 2011 and 2010. In January 2010, DHS entered into a daywork drilling contract with Desarrollos y Perforaciones De Mexico (“DPM”) to drill geothermal wells for the benefit of the Mexican national electric company (“CFE”) in the state of Puebla. The rig was released in July after drilling two wells. A total of $3.7 million has been invoiced to DPM for the project with $1.6 million being collected to date. The balance of $2.1 million has been reserved as a doubtful account due to concerns regarding collection, which is included as a component of assets held for sale — DHS subsidiary. Legal action is being taken to collect the amount owed to DHS and the rig is currently under contract.

(5) DHS Drilling

The carrying value of DHS’s drilling rigs and related equipment is assessed for impairment whenever circumstances indicate an impairment may exist. No such impairment provisions were recorded during the three and six months ended June 30, 2011 and 2010.

In January 2010, DHS entered into a daywork drilling contract with Desarrollos y Perforaciones De Mexico (“DPM”) to drill geothermal wells for the benefit of the Mexican national electric company (“CFE”) in the state of Puebla. The rig was released in July after drilling two wells. A total of $3.7 million has been invoiced to DPM for the project with $1.6 million being collected to date. The balance of $2.1 million has been reserved as a doubtful account due to concerns regarding collection, which is included as a component of assets held for sale — DHS subsidiary. Legal action is being taken to collect the amount owed to DHS and the rig is currently under contract.