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Net Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net Income Per Unit [Line Items]        
Net income attributable to partners $ 24,885 $ 25,582 $ 44,581 $ 45,577
Less: Partners' distribution 20,754 18,784 40,769 37,071
Distributions (in excess of) less than earnings $ (4,029) $ 598 $ (11,771) $ (3,404)
Footnote [Abstract]        
General partner's ownership interest (as percent) 2.00% 2.00% 2.00% 2.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest, Excess Per Unit Of Cash Distribution     $ 0.43125  
Common Units        
Net Income Per Unit [Line Items]        
Common units - (basic) (in shares) 24,409,359 24,386,031 24,408,270 24,384,341
Common units - (diluted) (in shares) 24,414,343 24,394,103 24,414,077 24,391,760
Common units - (basic) (in dollars per share) $ 0.69 $ 0.79 $ 1.20 $ 1.38
Common units - (diluted) (in dollars per share) $ 0.69 $ 0.79 $ 1.20 $ 1.38
General Partner        
Net Income Per Unit [Line Items]        
Net income attributable to partners $ 8,079 $ 6,212 $ 15,349 $ 11,842
Less: General partner's distribution (including IDRs) [1] 8,160 6,200 15,583 11,910
Distributions (in excess of) less than earnings (81) 12 (235) (68)
Total partner's earnings 8,079 6,212 15,348 11,842
Common unitholders | Common Units        
Net Income Per Unit [Line Items]        
Less: Partners' distribution 20,754 18,784 40,769 37,071
Distributions (in excess of) less than earnings (3,948) 586 (11,536) (3,336)
Total partner's earnings $ 16,806 $ 19,370 $ 29,233 $ 33,735
Common units - (basic) (in shares) [2] 24,409,359 24,386,031 24,408,270 24,384,341
Common units - (diluted) (in shares) [2] 24,414,343 24,394,103 24,414,077 24,391,760
Common units - (basic) (in dollars per share) [2] $ 0.69 $ 0.79 $ 1.20 $ 1.38
Common units - (diluted) (in dollars per share) [2] $ 0.69 $ 0.79 $ 1.20 $ 1.38
[1] General partner distributions (including IDRs) consist of the 2.0% general partner interest and IDRs, which represent the right of the general partner to receive increasing percentages of quarterly distributions of available cash from operating surplus in excess of 0.43125 per unit per quarter. See Note 8 for further discussion related to IDRs.
[2] There were no outstanding common units excluded from the diluted earnings per unit calculation for the three and six months ended June 30, 2019 and 2018.