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Partners' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
7 Months Ended 10 Months Ended 12 Months Ended
Jul. 20, 2015
Oct. 23, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction          
Common unitholders - units issued     35,490,000 35,490,000  
Common unitholders - units outstanding     35,490,000 35,490,000  
General Partner unitholders - units issued     35,526 35,526  
General Partner unitholders - units outstanding     35,526 35,526  
Total distributions paid to all classes of unitholders     $ 16,391 $ 48,422 $ 66,857
Issuance of Series A preferred units, net of issuance costs paid     $ 0 $ 53,138 0
Series A Preferred          
Related Party Transaction          
Units issued     3,000,000 3,000,000  
Units outstanding     3,000,000 3,000,000  
Issuance of preferred units in public offering 3,000,000        
Preferred stock liquidation preference $ 25        
Proceeds from issuance of preferred units, net of offering costs $ 72,300        
Offering costs 300        
Underwriting discounts and commissions $ 2,400        
Fixed payment rate per annum     9.00%    
Series B Preferred          
Related Party Transaction          
Units issued     2,200,000 2,200,000  
Units outstanding     2,200,000 2,200,000  
Issuance of preferred units in public offering   2,200,000   2,200,000  
Preferred stock liquidation preference   $ 25      
Proceeds from issuance of preferred units, net of offering costs   $ 53,000      
Underwriting discounts and commissions   $ 2,000      
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.    
Any time on or after August 12, 2020 | Series A Preferred          
Related Party Transaction          
Redemption price per share     $ 25    
From and including November 22, 2023 | Series B Preferred          
Related Party Transaction          
Preferred stock dividend payment rate description     3-month LIBOR plus a spread of 5.593%    
Floating rate per annum     5.593%    
Any time on or after November 22, 2023 | Series B Preferred          
Related Party Transaction          
Redemption price per share     $ 25    
Distribution 1 - FY 2018          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Apr. 18, 2018    
Distributions paid, Per unit     $ 0.25    
Distributions per unit declared - distribution date     May 03, 2018    
Distributions per unit declared - record date     Apr. 26, 2018    
Distribution from and including original issue date to, but excluding, November 22, 2023 | Series B Preferred          
Related Party Transaction          
Fixed payment rate per annum     8.75%    
Distribution 1 - FY 2019          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Jan. 25, 2019    
Distributions paid, Per unit     $ 0.0625    
Distributions per unit declared - distribution date     Feb. 14, 2019    
Distributions per unit declared - record date     Feb. 07, 2019    
Distribution 2 - FY 2019          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Apr. 24, 2019    
Distributions paid, Per unit     $ 0.0625    
Total distributions paid to all classes of unitholders     $ 2,200    
Distributions per unit declared - distribution date     May 10, 2019    
Distributions per unit declared - record date     May 03, 2019    
Distribution from November 12, 2018 to February 11, 2019 | Series A Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Jan. 21, 2019    
Distributions paid, Per unit     $ 0.5625    
Distributions per unit declared - distribution date     Feb. 12, 2019    
Distributions per unit declared - record date     Feb. 05, 2019    
Distribution from February 12, 2019 to May 11, 2019 | Series A Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Apr. 25, 2019    
Distributions paid, Per unit     $ 0.5625    
Distributions per unit declared - distribution date     May 13, 2019    
Distributions per unit declared - record date     May 06, 2019    
Distribution from May 12, 2019 to August 11, 2019 | Series A Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Jul. 22, 2019    
Distributions paid, Per unit     $ 0.5625    
Distributions per unit declared - distribution date     Aug. 11, 2019    
Distributions per unit declared - record date     Aug. 05, 2019    
Distribution from August 12, 2019 to November 11, 2019 | Series A Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Oct. 22, 2019    
Distributions paid, Per unit     $ 0.5625    
Distributions per unit declared - distribution date     Nov. 12, 2019    
Distributions per unit declared - record date     Nov. 05, 2019    
Distribution from October 23, 2018 to February 21, 2019 | Series B Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Jan. 31, 2019    
Distributions paid, Per unit     $ 0.7231    
Distributions per unit declared - distribution date     Feb. 22, 2019    
Distributions per unit declared - record date     Feb. 15, 2019    
Distribution from February 22, 2019 to May 21, 2019 | Series B Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Apr. 30, 2019    
Distributions paid, Per unit     $ 0.546875    
Distributions per unit declared - distribution date     May 22, 2019    
Distributions per unit declared - record date     May 15, 2019    
Distribution from May 22, 2019 to August 21, 2019 | Series B Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Jul. 30, 2019    
Distributions paid, Per unit     $ 0.546875    
Distributions per unit declared - distribution date     Aug. 22, 2019    
Distributions per unit declared - record date     Aug. 15, 2019    
Distribution from August 22, 2019 to November 21, 2019 | Series B Preferred          
Related Party Transaction          
Distribution Made To Limited Partner And General Partner Announcement Date     Oct. 30, 2019    
Distributions paid, Per unit     $ 0.546875    
Distributions per unit declared - distribution date     Nov. 22, 2019    
Distributions per unit declared - record date     Nov. 15, 2019    
General Partner          
Related Party Transaction          
General Partner Distributions     $ 4 $ 59 $ 129
Sponsor          
Related Party Transaction          
Common unitholders - units outstanding     15,595,000