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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.

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