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Net Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net Income Per Unit [Line Items]        
Net income attributable to partners $ 46,328 $ 30,530 $ 118,539 $ 75,112
Less: Partners' distribution 39,307 21,487 87,536 62,256
Allocation of earnings in excess (deficit) of distributions $ 7,021 $ 151 $ 12,385 $ (11,619)
Common Units Excluded From Computation Of Earnings Per Unit, Units 0 0 0 0
Footnote [Abstract]        
Common Units Excluded From Computation Of Earnings Per Unit, Units 0 0 0 0
Common Units        
Net Income Per Unit [Line Items]        
Common units - (basic) (in shares) 36,889,761 24,417,285 30,290,051 24,411,308
Common units - (diluted) (in shares) 36,894,043 24,420,582 30,292,261 24,417,466
Common units - (basic) (in dollars per share) $ 1.26 $ 0.89 $ 3.30 $ 2.08
Common units - (diluted) (in dollars per share) $ 1.26 $ 0.89 $ 3.30 $ 2.08
General Partner        
Net Income Per Unit [Line Items]        
Net income attributable to partners   $ 8,895 $ 18,725 $ 24,244
Less: General partner's distribution (including IDRs) $ 0 8,892 18,618 24,475
Allocation of earnings in excess (deficit) of distributions 0 3 106 (231)
Total partner's earnings 0 8,895 18,724 24,244
Common unitholders        
Net Income Per Unit [Line Items]        
Less: Partners' distribution     87,536 62,256
Allocation of earnings in excess (deficit) of distributions     $ 12,279 $ (11,388)
Common units - (basic) (in shares)     30,290,051 24,411,308
Common units - (diluted) (in shares)     30,292,261 24,417,466
Common units - (basic) (in dollars per share)     $ 3.30 $ 2.08
Common units - (diluted) (in dollars per share)     $ 3.30 $ 2.08
Common unitholders | Common Units        
Net Income Per Unit [Line Items]        
Less: Partners' distribution 39,307 21,487    
Allocation of earnings in excess (deficit) of distributions 7,021 148    
Total partner's earnings $ 46,328 $ 21,635 $ 99,815 $ 50,868
Common units - (basic) (in shares) 36,889,761 24,417,285    
Common units - (diluted) (in shares) 36,894,043 24,420,582    
Common units - (basic) (in dollars per share) $ 1.26 $ 0.89    
Common units - (diluted) (in dollars per share) 1.26 $ 0.89    
Maximum        
Footnote [Abstract]        
Distribution Payment Targets $ 0.43125      
General Partnership        
Footnote [Abstract]        
General partner's ownership interest (as percent) 0.00% 2.00% 2.00% 2.00%