Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2012

Other Liabilities Disclosure [Abstract]

Other Liabilities [Table Text Block]

		December 31,
		2012		2011
Asset retirement obligations	$	139,821	$	45,180
Long-term derivative liabilities		7,402		16,067
Other		469		1
Total Other Liabilities	$	147,692	$	61,248

		Year Ended
		December 31,
		2012		2011
Carrying amount of asset retirement obligations, as of beginning of period	$	47,258	$	42,997
Increase due to revised estimates		102,447		14,609
Accretion expense (included in DD&A expense)		7,542		4,478
Impact of foreign currency exchange rate changes		3,019		430
Payment of asset retirement obligations		(8,521)		(15,256)
Liabilities incurred and assumed		24,331		-
Carrying amount of asset retirement obligations, as of end of year		176,076		47,258
Less: current portion of asset retirement obligations		(36,255)		(2,078)
Long-term asset retirement obligations	$	139,821	$	45,180