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Subsequent Events Distribution Declaration (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended
Feb. 13, 2015
Nov. 14, 2014
Aug. 14, 2014
May 14, 2014
Feb. 13, 2014
Mar. 31, 2015
Mar. 31, 2014
Apr. 21, 2015
Subsequent Event [Line Items]                
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.510us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.490us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.475us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.415us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit      
Total Quarterly Distribution per Limited Partner Unit           $ 0.530us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 0.425us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit  
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Total Quarterly Distribution per Limited Partner Unit               $ 0.530us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember