Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		Quoted Market Prices			Significant Other			Significant
		in Active Markets -			Observable Inputs -			Unobservable Inputs -			Total
		Level 1			Level 2			Level 3			Fair Value
As of December 31, 2012:
Embedded derivatives			$	-		$	-		$	(7,402)		$	(7,402)
Total derivative liabilities			$	-		$	-		$	(7,402)		$	(7,402)
As of December 31, 2011:
Oil and gas derivative contracts:
	Oil and gas puts		$	-		$	1,038		$	209			1,247
Embedded derivatives				-			-			(16,067)			(16,067)
Total derivative liabilities			$	-		$	1,038		$	(15,858)		$	(14,820)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

				Year Ended
				December 31,
				2012		2011
Balance at beginning of period			$	(15,858)	$	(26,703)
	Total gains or losses (realized/unrealized)
		Included in earnings		8,456		11,428
		Purchases		-		1,239
		Settlements		-		(1,822)
Balance at end of period			$	(7,402)	$	(15,858)
Changes in unrealized gains (losses) relating to derivatives assets and liabilities
	still held at the end of the period		$	8,665	$	11,428