Statements of Combined Consolidated Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
REVENUES
Affiliate	$ 142,667	$ 77,443
Third-party	14,172	9,894
Total Revenues	156,839	87,337
COSTS AND EXPENSES
Operating and maintenance expenses	72,769	54,302
Imbalance settlement gains	(9,686)	(7,153)
Depreciation and amortization expenses	13,057	11,277
General and administrative expenses	15,713	8,776
Loss on asset disposals	535	26
Total Costs and Expenses	92,388	67,228
OPERATING INCOME (LOSS)	64,451	20,109
Less: Interest and financing costs, net	8,992	1,610
Add: Interest income	48	0
NET INCOME (LOSS)	55,507	18,499
Less: Income (loss) attributable to Predecessors	(1,284)	(16,069)
Net income attributable to partners	56,791	34,568
Less: General partner's interest in net income, including incentive distribution rights	2,674	692
Limited partners' interest in net income	$ 54,117	$ 33,876
Net income per limited partner unit:
Common - basic (dollars per unit)	$ 1.90	$ 1.11
Common - diluted (dollars per unit)	$ 1.89	$ 1.11
Subordinated - basic and diluted (dollars per unit)	$ 1.47	$ 1.11	[1]
Weighted average limited partner units outstanding:
Common units - basic (units)	16,614,668	15,254,890
Common units - diluted (units)	16,708,950	15,282,366
Subordinated units - basic and diluted (units)	15,254,890	15,254,890
Cash distributions per unit (dollars per unit)	$ 1.715	$ 0.9573

[1] Net income per unit is only calculated for the Partnership after the Initial Offering as no units were outstanding prior to April 26, 2011.