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Net Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net income per unit [Line Items]        
Net income attributable to partners   $ 96,749 $ 90,182 $ 69,409
(Distributions) earnings excess   $ (20,616) $ (11,708) $ (18,445)
Weighted average limited partner units outstanding:        
Common units - (basic) (in units)   24,413,294 24,390,286 24,348,063
Common units - (diluted) (in units)   24,418,641 24,396,881 24,376,972
Net income per limited partner unit:        
Common units - (basic) (in usd per unit)   $ 2.61 $ 2.65 $ 2.09
Common units - (diluted) (in usd per unit)   $ 2.61 $ 2.65 $ 2.09
Footnote [Abstract]        
General partner's ownership interest   2.00% 2.00% 2.00%
Common units excluded from computation of earnings per share (in units)   0 1,776 0
Maximum        
Footnote [Abstract]        
Distribution payment targets (in usd per unit) $ 0.43125      
General Partner        
Net income per unit [Line Items]        
Net income attributable to partners   $ 33,080 $ 25,543 $ 18,429
General partner's distribution   33,492 25,777 18,797
(Distributions) earnings excess   (412) (234) (368)
Total earnings   33,080 25,543 18,429
Limited Partner        
Net income per unit [Line Items]        
Limited partners' distribution   83,873 76,113 69,057
(Distributions) earnings excess   (20,204) (11,474) (18,077)
Total earnings   $ 63,669 $ 64,639 $ 50,980
Weighted average limited partner units outstanding:        
Common units - (basic) (in units)   24,413,294 24,390,286 24,348,063
Common units - (diluted) (in units)   24,418,641 24,396,881 24,376,972
Net income per limited partner unit:        
Common units - (basic) (in usd per unit)   $ 2.61 $ 2.65 $ 2.09
Common units - (diluted) (in usd per unit)   $ 2.61 $ 2.65 $ 2.09