Equity (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General Partners' Cumulative Cash Distributions		$ 326			$ 0	$ 481	$ 0
Incentive Distribution, Distribution		326			0	481	0		$ 0
Distribution Made to Limited Partner, Cash Distributions Paid		17,092			14,028	48,924	38,582
Partners' Capital Account, Distributions		17,418			$ 14,028	49,405	$ 38,582
Dividend Arrearges, Common Limited Partner Units		$ 0				$ 0
Distribution Made to Limited Partner, Distributions Declared, Per Unit		$ 0.3650	$ 0.3475	$ 0.3325	$ 0.3075	$ 1.0450	$ 0.8457
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	$ 0.3825							$ 1.4275
Common Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 8,766			$ 7,014	$ 25,086	$ 19,291
Subordinated Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid		$ 8,326			$ 7,014	$ 23,838	$ 19,291