(13) Subsequent Events (Details) (Tranche B Term Loan)	3 Months Ended
	Mar. 31, 2013
Tranche B Term Loan
Debt Instrument, Payment Terms	The Lenders agreed that, in connection with the previous sale of our natural gas compressor assets held for sale (see Note 2) (a) 50% of the net cash proceeds are to be applied to pay (i) first, an amendment fee and (ii) second, to repay the Tranche B Loan in accordance with each Tranche B Lender’s pro rata share, and (ii) 50% of the net cash proceeds are to be retained by us and used for general corporate purposes.
Debt instrument prepayment terms	Net cash proceeds of asset dispositions (other than as a result of a casualty), debt issuances and equity issuances can no longer be invested by us, and must be used to prepay the Loan Agreement, other than net cash proceeds from asset sales for fair market value resulting in no more than $150,000 in net cash proceeds per disposition (or series of related dispositions) and less than $300,000 in aggregate net cash proceeds before the Maturity Date.
Debt Instrument, Maturity Date, Description	The Lenders agreed to extend the maturity date of the Tranche B Loan to December 31, 2013.