Partners' Capital and Partnership Distributions Partnership Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.22	$ 0	$ 0
Diamondback Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid				$ (30,997)
Limited Partners' Capital Account, Distribution Amount		$ 13,400	$ 17,600