Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash	$ 31,836	$ 17,433
Accounts receivable	41,897	32,263
Due from affiliates		3,734
Due from general partner	165
Derivative instruments	45,522	32,683
Prepaid and other current assets	2,642	249
Total current assets	122,062	86,362
Noncurrent assets:
Evaluated	1,656,146	1,076,828
Unevaluated	11,500
Gross oil and natural gas properties	1,667,646	1,076,828
Less accumulated depreciation, depletion and amortization	(203,377)	(97,581)
Total property and equipment, net	1,464,269	979,247
Derivative instruments	76,621	72,814
Deferred taxes		270
Other assets	23,575	15,651
Total noncurrent assets	1,564,465	1,067,982
Total assets	1,686,527	1,154,344
Current liabilities:
Current portion of asset retirement obligations	1,426	348
Derivative instruments	8,727	9,569
Accrued and other liabilities	46,284	50,027
Total current liabilities	56,437	59,944
Noncurrent liabilities:
Long-term debt	766,076	615,000
Derivative instruments	16,993	24,489
Asset retirement obligations	125,565	92,213
Deferred taxes	102
Other liabilities	6,790
Total noncurrent liabilities	915,526	731,702
Commitments and contingencies (See Note 9)
Partners' capital:
Predecessor's capital		(52,143)
Class C convertible preferred unitholders (16,666,667 issued and outstanding as of December 31, 2012 and 2011)	373,068	358,138
General partner (51,036 and 35,729 units issued and outstanding as of December 31, 2012 and 2011)	710	546
Total partners' capital	714,564	362,698
Total liabilities and partners' capital	1,686,527	1,154,344
Limited Partners-Public Common [Member]
Partners' capital:
Limited partners' capital account	403,757	241,306
Total partners' capital	403,757	241,306
Limited Partners-Affiliated - Common [Member]
Partners' capital:
Limited partners' capital account	(62,971)	(113,414)
Total partners' capital	(62,971)	(113,414)
Limited Partners-Affiliated - Subordinated [Member]
Partners' capital:
Limited partners' capital account		(71,735)
Total partners' capital		$ (71,735)