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Partners' Equity and Cash Distributions (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 26, 2016
$ / shares
Feb. 16, 2016
USD ($)
$ / shares
Mar. 31, 2016
item
$ / shares
shares
Mar. 31, 2015
Dec. 31, 2015
shares
Partners' Equity and Cash Distributions          
General partner interest (as a percent)     0.67% 0.74%  
Repurchased units not deemed outstanding | shares     478,060   488,719
Period of distribution of available cash after end of each quarter     45 days    
Number of quarters of cash reserves to provide funds for distributions to unitholders and General Partner | item     4    
Cash Distribution Payment          
Per Unit Cash Distribution (in dollars per unit)   $ 0.4625      
Cash distribution | $   $ 15,829      
Distribution declared          
Quarterly cash distribution declared (in dollars per unit) $ 0.4625        
Affiliates of general partner          
Partners' Equity and Cash Distributions          
General partner interest (as a percent)     21.90%    
Subsequent event          
Distribution declared          
Quarterly cash distribution declared (in dollars per unit) 0.4625        
Subsequent event | Annualized basis          
Distribution declared          
Quarterly cash distribution declared (in dollars per unit) 1.85        
Common Unitholders          
Partners' Equity and Cash Distributions          
Units issued | shares     33,995,563    
Distribution declared          
Quarterly cash distribution declared (in dollars per unit) 0.4625        
Common Unitholders | Annualized basis          
Distribution declared          
Quarterly cash distribution declared (in dollars per unit) $ 1.85        
Common Unitholders | Affiliates of general partner          
Partners' Equity and Cash Distributions          
Units issued | shares     7,434,775    
General Partner Interest          
Partners' Equity and Cash Distributions          
Units issued | shares     230,303    
Common Unitholders          
Partners' Equity and Cash Distributions          
Limited partner ownership interest (as a percent)     99.33%    
Cash Distribution Payment          
Cash distribution | $   15,723      
General Partner          
Partners' Equity and Cash Distributions          
General partner interest (as a percent)     0.67%    
Cash Distribution Payment          
Cash distribution | $   $ 106      
First Target Distribution | Maximum          
Partners' Equity and Cash Distributions          
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.4625    
First Target Distribution | Common Unitholders | Common Unitholders          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     99.33%    
First Target Distribution | General Partner | General Partner Interest          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     0.67%    
Second Target Distribution | Minimum          
Partners' Equity and Cash Distributions          
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.4625    
Second Target Distribution | Maximum          
Partners' Equity and Cash Distributions          
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.5375    
Second Target Distribution | Common Unitholders | Common Unitholders          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     86.33%    
Second Target Distribution | General Partner | General Partner Interest          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     13.67%    
Third Target Distribution | Minimum          
Partners' Equity and Cash Distributions          
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.5375    
Third Target Distribution | Maximum          
Partners' Equity and Cash Distributions          
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.6625    
Third Target Distribution | Common Unitholders | Common Unitholders          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     76.33%    
Third Target Distribution | General Partner | General Partner Interest          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     23.67%    
Thereafter | Minimum          
Partners' Equity and Cash Distributions          
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.6625    
Thereafter | Common Unitholders | Common Unitholders          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     51.33%    
Thereafter | General Partner | General Partner Interest          
Partners' Equity and Cash Distributions          
Marginal Percentage Interest in Distributions     48.67%