Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash	$ 15,580	$ 31,836
Accounts receivable	53,517	41,897
Due from general partner	7	165
Due from affiliates	2,847
Derivative instruments	29,762	45,522
Prepaid and other current assets	188	2,642
Total current assets	101,901	122,062
Noncurrent assets:
Evaluated	1,677,511	1,656,146
Unevaluated	11,500	11,500
Gross oil and natural gas properties	1,689,011	1,667,646
Less accumulated depreciation, depletion and amortization	(234,191)	(203,377)
Total property and equipment, net	1,454,820	1,464,269
Derivative instruments	68,738	76,621
Other assets	22,921	23,575
Total noncurrent assets	1,546,479	1,564,465
Total assets	1,648,380	1,686,527
Current liabilities:
Current portion of asset retirement obligations	903	1,426
Derivative instruments	12,254	8,727
Accrued and other liabilities	49,844	46,284
Total current liabilities	63,001	56,437
Noncurrent liabilities:
Long-term debt	766,205	766,076
Derivative instruments	14,112	16,993
Asset retirement obligations	127,000	125,565
Other liabilities	6,642	6,892
Total noncurrent liabilities	913,959	915,526
Commitments and contingencies (See Note 9)
Partners' capital:
Predecessor's capital
Class C convertible preferred unitholders (16,666,667 issued and outstanding as of March 31, 2013 and December 31, 2012)	376,897	373,068
General partner (51,036 issued and outstanding as of March 31, 2013 and December 31, 2012)	672	710
Class B convertible unitholders (6,133,558 and 0 units issued and outstanding as of March 31, 2013 and December 31, 2012)
Total partners' capital	671,420	714,564
Total liabilities and partners' capital	1,648,380	1,686,527
Limited Partners-Public Common [Member]
Partners' capital:
Limited partners' capital account	362,643	403,757
Total partners' capital	362,643	403,757
Limited Partners-Affiliated - Common [Member]
Partners' capital:
Limited partners' capital account	(68,792)	(62,971)
Total partners' capital	$ (68,792)	$ (62,971)