Condensed Statements of Combined Consolidated Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 37,851	$ 23,270
Adjustments to reconcile net income to net cash from (used in) operating activities:
Depreciation and amortization expenses	10,419	5,690
Amortization of debt issuance costs	822	384
Unit-based compensation expense	934	712
Loss on asset disposals	164	236
Changes in current assets:
Receivables - trade	(1,706)	47
Receivables - affiliate	(6,315)	(311)
Prepayments and other	(386)	(829)
Changes in current liabilities:
Accounts payable - trade	1,210	228
Accounts payable - affiliate	1,421	696
Deferred revenue - affiliate	61	173
Other current liabilities	125	101
Changes in other noncurrent assets and liabilities	646	1,464
Net cash from operating activities	45,246	31,861
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Capital expenditures	(26,347)	(32,499)
Capital expenditure reimbursements by affiliate	320	4,204
Acquisitions	314,757	0
Net cash used in investing activities	(340,784)	(28,295)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of issuance costs	391,348	0
Proceeds from issuance of general partner units, net of issuance costs	8,319	0
Quarterly distributions to unitholders	(43,838)	(22,665)
Quarterly distributions to general partner	(3,066)	(462)
Distributions in connection with acquisitions	(544,000)	(67,500)
Borrowings under revolving credit agreement	544,000	68,000
Payments on capital lease	(162)	0
Financing costs	(3,294)	(593)
Capital contributions by affiliate	2,778	1,119
Sponsor contributions of equity to the Predecessors	0	21,617
Net cash from (used in) financing activities	352,085	(484)
INCREASE IN CASH AND CASH EQUIVALENTS	56,547	3,082
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	19,290	18,326
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 75,837	$ 21,408