Equity (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2016
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Incentive Distribution, Distribution		$ 761	$ 16
Distribution Made to Limited Partner, Cash Distributions Paid		18,549	15,559
Partners' Capital Account, Distributions		$ 19,620	$ 15,575
Distribution Made to Limited Partner, Distributions Declared, Per Unit		$ 0.3925	$ 0.3325
Subsequent Event [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.4025			$ 0.7950
TexNew Mex Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 310	$ 0
Common Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		9,595	7,974
Subordinated Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 8,954	$ 7,585