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Cash Distributions and Earnings per Unit (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 4 Months Ended 7 Months Ended 10 Months Ended 12 Months Ended
Jan. 26, 2015
Jan. 24, 2014
Jan. 21, 2013
Jan. 24, 2012
Apr. 25, 2014
Apr. 22, 2013
Apr. 25, 2012
Jul. 24, 2014
Jul. 22, 2013
Jul. 23, 2012
Oct. 23, 2014
Oct. 25, 2013
Oct. 18, 2012
Dec. 31, 2014
Net Income Loss [Abstract]                            
Quarterly cash distributions $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.44us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.44us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.4425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit  
Aggregate amount of cash distribution $ 38,097us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 32,573us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 29,936us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 24,829us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 35,474us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 29,936us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 26,923us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 35,474us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 29,936us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 27,563us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 35,474us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 32,573us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 27,563us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid  
Description of the distribution amount per unit for all classes of units                           The amount of the minimum quarterly distribution is $0.35 per unit or $1.40 per unit per year and is made in the following manner: First, 98% to all unitholders.
Description Of Loss Allocation                           Net loss per unit undistributed is determined by taking the distributions in excess of net income and allocating between common units and general partner units on a 98%-2% basis. There were no options or phantom units outstanding during the years ended December 31, 2014, 2013 and 2012.