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Summary of Quarterly Financial Information (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										9 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Oct. 06, 2013	Dec. 31, 2014	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 170,411us-gaap_Revenues	$ 169,441us-gaap_Revenues	$ 155,168us-gaap_Revenues	$ 140,306us-gaap_Revenues	$ 127,583us-gaap_Revenues	$ 149,388us-gaap_Revenues	[1]	$ 62,278us-gaap_Revenues	$ 59,569us-gaap_Revenues	$ 62,420us-gaap_Revenues	$ 206,072us-gaap_Revenues	$ 635,326us-gaap_Revenues	$ 260,294us-gaap_Revenues
Total operating income (loss)	31,282us-gaap_OperatingIncomeLoss	43,412us-gaap_OperatingIncomeLoss	42,539us-gaap_OperatingIncomeLoss	24,088us-gaap_OperatingIncomeLoss	(117,110)us-gaap_OperatingIncomeLoss						53,553us-gaap_OperatingIncomeLoss	141,321us-gaap_OperatingIncomeLoss	88,689us-gaap_OperatingIncomeLoss
Net income	10,964us-gaap_ProfitLoss	22,734us-gaap_ProfitLoss	25,281us-gaap_ProfitLoss	11,231us-gaap_ProfitLoss	193,431us-gaap_ProfitLoss	148,917us-gaap_ProfitLoss	[1]	2,281us-gaap_ProfitLoss	3,071us-gaap_ProfitLoss	1,930us-gaap_ProfitLoss	(37,232)us-gaap_ProfitLoss	70,210us-gaap_ProfitLoss	48,643us-gaap_ProfitLoss
Net income attributable to common unitholders	$ 10,729us-gaap_NetIncomeLoss	$ 22,493us-gaap_NetIncomeLoss	$ 25,281us-gaap_NetIncomeLoss	$ 11,231us-gaap_NetIncomeLoss	$ 193,431us-gaap_NetIncomeLoss							$ 69,734us-gaap_NetIncomeLoss
Earnings per unit - basic and diluted	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic							$ 0.27us-gaap_EarningsPerShareBasic
Diluted earnings per unit (in dollars per unit)	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted							$ 0.27us-gaap_EarningsPerShareDiluted
[1] The results of operations of our predecessor for October 1, 2013 through October 6, 2013 and the results of operations of our company for October 7, 2013 through December 31, 2013 have been combined.

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