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Partners' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 7 Months Ended 12 Months Ended
Jan. 23, 2017
shares
Jul. 20, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Related Party Transaction          
Common unitholders - units issued | shares     35,490,000 20,505,000  
Common unitholders - units outstanding | shares     35,490,000 20,505,000  
Series A Preferred Units issued | shares     3,000,000 3,000,000  
Series A Preferred Units outstanding | shares     3,000,000 3,000,000  
General Partner unitholders - units issued | shares     35,526 35,526  
General Partner unitholders - units outstanding | shares     35,526 35,526  
Issuance of Series A preferred units, net of issuance costs paid     $ 0 $ 0 $ 72,446
Total distributions paid to all classes of unitholders     $ 66,857 66,856 62,207
Distribution 4 - FY 2016          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Declaration Date     Jan. 01, 2017    
Distributions paid, Per unit | $ / shares     $ 0.4225    
Total distributions paid to all classes of unitholders     $ 15,000    
Distributions per unit declared - distribution date     Jan. 19, 2017    
Distributions per unit declared - record date     Jan. 11, 2017    
Distribution 1 - FY 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Apr. 12, 2017    
Distributions paid, Per unit | $ / shares     $ 0.4225    
Total distributions paid to all classes of unitholders     $ 15,000    
Distributions per unit declared - distribution date     Apr. 28, 2017    
Distributions per unit declared - record date     Apr. 21, 2017    
Distribution 2 - FY 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Declaration Date     Jul. 01, 2017    
Distributions paid, Per unit | $ / shares     $ 0.4225    
Total distributions paid to all classes of unitholders     $ 15,000    
Distributions per unit declared - distribution date     Jul. 18, 2017    
Distributions per unit declared - record date     Jul. 11, 2017    
Distribution 3 - FY 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Declaration Date     Oct. 02, 2017    
Distributions paid, Per unit | $ / shares     $ 0.4225    
Total distributions paid to all classes of unitholders     $ 15,000    
Distributions per unit declared - distribution date     Oct. 19, 2017    
Distributions per unit declared - record date     Oct. 12, 2017    
General Partner          
Related Party Transaction          
General Partner Distributions     $ 129 $ 127 $ 130
Series A Preferred          
Related Party Transaction          
Units issued | shares   3,000,000     3,000,000
Preferred Stock Dividend Rate Percentage   9.00% 9.00%    
Preferred stock liquidation preference | $ / shares   $ 25      
Issuance of preferred units, net of issuance costs incurred   $ 72,300      
Underwriting discounts and commissions   2,400      
Offering costs   $ 300      
Series A Preferred | Distribution from November 12, 2016 to February 11, 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Declaration Date     Jan. 19, 2017    
Distributions paid, Per unit | $ / shares     $ 0.5625    
Distributions per unit declared - distribution date     Feb. 13, 2017    
Distributions per unit declared - record date     Feb. 05, 2017    
Series A Preferred | Distribution from February 12, 2017 to May 11, 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Apr. 21, 2017    
Distributions paid, Per unit | $ / shares     $ 0.5625    
Distributions per unit declared - distribution date     May 12, 2017    
Distributions per unit declared - record date     May 05, 2017    
Series A Preferred | Distribution from May 12, 2017 to August 11, 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Declaration Date     Jul. 19, 2017    
Distributions paid, Per unit | $ / shares     $ 0.5625    
Distributions per unit declared - distribution date     Aug. 14, 2017    
Distributions per unit declared - record date     Aug. 05, 2017    
Series A Preferred | Distribution from August 12, 2017 to November 11, 2017          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Oct. 19, 2017    
Distributions paid, Per unit | $ / shares     $ 0.5625    
Distributions per unit declared - distribution date     Nov. 13, 2017    
Distributions per unit declared - record date     Nov. 05, 2017    
Sponsor          
Related Party Transaction          
Common unitholders - units outstanding | shares     15,595,000    
Ownership percentage in Dynagas LNG Partners LP     43.90%    
Partners' subordinated units converted | shares 14,985,000        
Subordinated units converted to Common, Conversion Basis     one-for-one basis    
Subordinated units converted to Common, Conversion Ratio 1        
After subordination period          
Related Party Transaction          
Distribution payment terms     First, 100% to the holders of common units and to the General Partner in accordance with their relative percentage interests, until the distributed amount in respect of each common unit equals the minimum quarterly distribution; and second, 100% to the holders of common units and to the General Partner in accordance with their relative percentage interests, until each unit has received an aggregate distribution of a specified dollar amount.