Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows provided by operating activities:
Net income (loss)	$ 15,648	$ 774
Adjustment to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	14,582	6,108
Equity-based compensation	4,623	1,313
Amortization of deferred financing costs	244
Changes in assets and liabilities:
Accounts receivable-affiliate	(1,170)	(1,475)
Prepaid expenses	162	(63)
Accounts payable	168	16
Accounts payable-affiliate	641
Accrued liabilities	4,837	(68)
Net cash provided by operating activities	39,735	6,605
Cash flows used in investing activities:
Additions to property and equipment	(126,014)	(104,333)
Change in working capital of affiliate related to property and equipment	40,277
Change in other assets	(7,515)	(2,792)
Net cash used in investing activities	(93,252)	(107,125)
Cash flows provided by financing activities:
Deemed contribution from (distribution to) parent, net		49,649
Payments of Capital Distribution	14,322
Distribution to unitholders	(14,322)
Borrowings on bank credit facility		51,461
Payments of deferred financing costs	(14)
Payments on capital lease obligations		(227)
Payments for IPO related costs		(363)
Net cash provided by financing activities	(14,336)	100,520
Net increase in cash and cash equivalents	(67,853)
Cash and cash equivalents, beginning of period	230,192
Cash and cash equivalents, end of period	162,339
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	579	40
Supplemental disclosure of noncash investing activities:
Increase in accrued capital expenditures and accounts payable for property and equipment	$ (12,367)	$ 22,781