Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value of Financial Assets and Liabilities
Total assets	$ 594	$ 162
Total liabilities	29,263	12,538
Net assets (liabilities) at fair value	(28,669)	(12,376)
Level 1 [Member]
Fair Value of Financial Assets and Liabilities
Total assets	609	393
Total liabilities	29,278	12,411
Net assets (liabilities) at fair value	(28,669)	(12,018)
Level 2 [Member]
Fair Value of Financial Assets and Liabilities
Total assets
Total liabilities		358
Net assets (liabilities) at fair value		(358)
Level 3 [Member]
Fair Value of Financial Assets and Liabilities
Total assets
Total liabilities
Net assets (liabilities) at fair value
Netting [Member]
Fair Value of Financial Assets and Liabilities
Total assets	15	231
Total liabilities	15	231
Net assets (liabilities) at fair value
Commodity Derivatives [Member]
Fair Value of Financial Assets and Liabilities
Total assets	594	162
Total liabilities
Commodity Derivatives [Member] | Level 1 [Member]
Fair Value of Financial Assets and Liabilities
Total assets	609	393
Total liabilities	(15)	(231)
Commodity Derivatives [Member] | Level 2 [Member]
Fair Value of Financial Assets and Liabilities
Total assets
Total liabilities
Commodity Derivatives [Member] | Level 3 [Member]
Fair Value of Financial Assets and Liabilities
Total assets
Total liabilities
Commodity Derivatives [Member] | Netting [Member]
Fair Value of Financial Assets and Liabilities
Total assets	15	231
Total liabilities	15	231
Warrants [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities	29,263	12,180
Warrants [Member] | Level 1 [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities	29,263	12,180
Warrants [Member] | Level 2 [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities
Warrants [Member] | Level 3 [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities
Warrants [Member] | Netting [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities
Interest Rate Swap [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities		358
Interest Rate Swap [Member] | Level 1 [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities
Interest Rate Swap [Member] | Level 2 [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities		358
Interest Rate Swap [Member] | Level 3 [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities
Interest Rate Swap [Member] | Netting [Member]
Fair Value of Financial Assets and Liabilities
Total liabilities