Certain Provisions of the Partnership agreement (Textual) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2013
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Approximate Date of Commencement of Proposed Sale to Public			May 29, 2014
Percentage Of Avaliable Cash to Distribute	100.00%		100.00%
Number Of Days From End Of Quarter For Distribution			45 days
Distribution Made to Limited Partner, Distribution Date	Aug. 13, 2014	May 14, 2014
Class B units conversion date			May 06, 2014
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.365	$ 0.36
Common Unit, Issuance Value	$ 75.0		$ 75.0
Partners' Capital Account, Units, Sold in Public Offering			600,000
Proceeds from Issuance of Common Limited Partners Units			19.9	0
Sales Commissions and Fees			$ 0.2
Class B units
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit		$ 0.10
General Partner [Member] | Incentive Distribution Percentage, Level1 [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Incentive Distribution Percentage Levels			13.00%
Incentive Distribution, Distribution Per Unit			$ 0.25
General Partner [Member] | Incentive Distribution Percentage, Level2 [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Incentive Distribution Percentage Levels			23.00%
Incentive Distribution, Distribution Per Unit			$ 0.3125
General Partner [Member] | Incentive Distribution Percentage, Level3 [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Incentive Distribution Percentage Levels			48.00%
Incentive Distribution, Distribution Per Unit			$ 0.375