Equity (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General Partners' Cumulative Cash Distributions		$ 139		$ 0		$ 155	$ 0
Incentive Distribution, Distribution		139		0		155	0
Distribution Made to Limited Partner, Cash Distributions Paid		16,273		13,572		31,832	24,554
Partners' Capital Account, Distributions		16,412		$ 13,572		31,987	$ 24,554
Dividend Arrearges, Common Limited Partner Units		$ 0				$ 0
Distribution Made to Limited Partner, Distributions Declared, Per Unit		$ 0.3475	$ 0.3325	$ 0.2975		$ 0.6800	$ 0.5382
Minimum Quarterly Distribution [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Payment Targets						$0.2875
Subsequent Event [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0
Distribution Made to Limited Partner, Distributions Paid, Per Unit					$ 1.0450
Common Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 8,346		$ 6,786		$ 16,320	$ 12,277
Subordinated Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 7,927		$ 6,786		$ 15,512	$ 12,277