Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Oil and gas	$ 47,658	$ 50,705
Costs and expenses:
Oil and gas production	14,087	10,974
Production and ad valorem taxes	4,147	3,794
Depletion, depreciation and amortization	6,884	4,832
General and administrative	1,898	1,887
Accretion of discount on asset retirement obligations	207	188
Interest	837	309
Derivative losses, net	2,208	14,539
Other	0	433
Total cost and expenses	30,268	36,956
Income before income taxes	17,390	13,749
Income tax provision	(220)	(179)
Net income	17,170	13,570
Allocation of net income applicable to the Partnership:
General partner's interest	17	14
Limited partners' interest	17,100	13,523
Unvested participating securities' interest	53	33
Net income applicable to the Partnership	$ 17,170	$ 13,570
Net income per common unit - basic and diluted	$ 0.48	$ 0.38
Weighted average common units outstanding - basic and diluted	35,714	35,714
Distributions declared per common unit	$ 0.52	$ 0.51