Earnings per Unit (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 15,323	$ 16,324
Net income attributable to General Partner	0	5,391	[1]
Net Income (Loss) Allocated to Limited Partners	15,323	10,933
Incentive Distribution, Distribution	16	0
Distribution Made to Limited Partner, Cash Distributions Declared	(15,575)
Net income attributable to Predecessor	0	5,391
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(252)	(49)
Increase (Decrease) in Partners' Capital	16	5,391
Common Units [Member]
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Cash Distributions Declared	(7,974)	(5,491)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(129)	(25)
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	7,845	5,466
Weighted Average Number of Shares Outstanding, Basic	23,985,000	22,811,000
Weighted Average Number of Shares Outstanding, Diluted	23,996,000	22,815,000
Earnings Per Share, Basic	$ 0.33	$ 0.24
Earnings Per Share, Diluted	$ 0.33	$ 0.24
Subordinated Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	0
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Cash Distributions Declared	(7,585)	(5,491)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(123)	(24)
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	$ 7,462	$ 5,467
Weighted Average Number of Shares Outstanding, Basic and Diluted	22,811,000	22,811,000
Earnings Per Share, Basic and Diluted	$ 0.33	$ 0.24

[1] For historical periods prior to the Wholesale Acquisition, we have applied the two-class method to calculate earnings per unit. The net income of WRW prior to the Wholesale Acquisition was allocated entirely to the general partner.