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Net Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Income Per Unit [Line Items]        
Net income attributable to partners $ 23,326 $ 16,923 $ 68,903 $ 50,495
Less: Partners' distribution 19,272 17,418 56,343 51,380
Allocation of distributions in excess of earnings $ (2,634) $ (5,347) $ (6,038) $ (14,582)
Footnote [Abstract]        
General partner's ownership interest (as percent) 2.00% 2.00% 2.00% 2.00%
Quarterly distributions of available cash, minimum level (in dollars per share)     0.43125  
Outstanding common unit equivalents excluded from diluted earnings per share (in shares) 1,776 0 1,776 10,090
Common Units        
Net Income Per Unit [Line Items]        
Common units - (basic) (in shares) 24,395,183 24,361,457 24,387,995 24,341,921
Common units - (diluted) (in shares) 24,401,908 24,389,582 24,395,880 24,382,426
Common units - (basic) (in dollars per share) $ 0.68 $ 0.50 $ 2.07 $ 1.52
Common units - (diluted) (in dollars per share) $ 0.68 $ 0.50 $ 2.07 $ 1.52
General Partner        
Net Income Per Unit [Line Items]        
Net income attributable to partners     $ 18,478  
Less: General partner's distribution (including IDRs) [1] $ 6,688 $ 4,852 18,598 $ 13,697
Allocation of distributions in excess of earnings (52) (107) (120) (291)
Total partner's earnings 6,636 4,745 18,478 13,406
Common unitholders | Common Units        
Net Income Per Unit [Line Items]        
Less: Partners' distribution 19,272 17,418 56,343 51,380
Allocation of distributions in excess of earnings (2,582) (5,240) (5,918) (14,291)
Total partner's earnings $ 16,690 $ 12,178 $ 50,425 $ 37,089
Common units - (basic) (in shares) [2] 24,395,183 24,361,457 24,387,995 24,341,921
Common units - (diluted) (in shares) [2] 24,401,908 24,389,582 24,395,880 24,382,426
Common units - (basic) (in dollars per share) [2] $ 0.68 $ 0.50 $ 2.07 $ 1.52
Common units - (diluted) (in dollars per share) [2],[3] $ 0.68 $ 0.50 $ 2.07 $ 1.52
[1] General partner distributions (including IDRs) consist of the 2% 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 9 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] Outstanding common unit equivalents of 1,776 were excluded from the diluted earnings per unit calculation for both the three and nine months ended September 30, 2018, as these common unit equivalents did not have a dilutive effect under the treasury stock method. Outstanding common unit equivalents totaling 10,090 were excluded from the diluted earnings per unit calculation for the nine months ended September 30, 2017. There were no outstanding common unit equivalents excluded from the diluted earnings per unit calculation for the three months ended September 30, 2017.