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Net Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net Income Per Unit [Line Items]    
Net income attributable to partners $ 19,696 $ 19,995
Less: Partners' distribution 20,014 18,287
Allocation of distributions in excess of earnings $ (7,742) $ (4,002)
Footnote [Abstract]    
General partner's ownership interest (as percent) 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) 24,407,168 24,382,633
Common units - (diluted) (in shares) 24,416,058 24,393,746
Common units - (basic) (in dollars per share) $ 0.51 $ 0.59
Common units - (diluted) (in dollars per share) $ 0.51 $ 0.59
General Partner    
Net Income Per Unit [Line Items]    
Net income attributable to partners $ 7,270 $ 5,630
Less: General partner's distribution (including IDRs) [1] 7,424 5,710
Allocation of distributions in excess of earnings (154) (80)
Total partner's earnings 7,270 5,630
Common unitholders | Common Units    
Net Income Per Unit [Line Items]    
Less: Partners' distribution 20,014 18,287
Allocation of distributions in excess of earnings (7,588) (3,922)
Total partner's earnings $ 12,426 $ 14,365
Common units - (basic) (in shares) [2] 24,407,168 24,382,633
Common units - (diluted) (in shares) [2] 24,416,058 24,393,746
Common units - (basic) (in dollars per share) [2] $ 0.51 $ 0.59
Common units - (diluted) (in dollars per share) [2],[3] $ 0.51 $ 0.59
[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] We base our calculation of net income per unit on the weighted-average number of common limited partner units outstanding during the period.
[3] There were no outstanding common units excluded from the diluted earnings per unit calculation for the three months ended March 31, 2019 and 2018