Related Party Transactions (Details Textual) (GeoCam [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
GeoCam [Member]
Related Party Transactions (Textual) [Abstract]
Outstanding shares of the holder	20.00%
Additional outstanding shares of other holders	19.50%
Expensed in project development	$ 0	$ 164

Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.

No definition available.

Name:	us-gaap_ProfessionalAndContractServicesExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration