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Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net Income Per Unit [Line Items] |  |  |  |
Net income attributable to partners | $ 30,530 | $ 23,326 | $ 75,112 | $ 68,903
Less: Partners' distribution | 21,487 | 19,272 | 62,256 | 56,343
Earnings in excess of (less than) distributions | $ 151 | $ (2,634) | $ (11,619) | $ (6,038)
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) | 24,417,285 | 24,395,183 | 24,411,308 | 24,387,995
Common units - (diluted) (in shares) | 24,420,582 | 24,401,908 | 24,417,466 | 24,395,880
Common units - (basic) (in dollars per share) | $ 0.89 | $ 0.68 | $ 2.08 | $ 2.07
Common units - (diluted) (in dollars per share) | $ 0.89 | $ 0.68 | $ 2.08 | $ 2.07
General Partner |  |  |  |
Net Income Per Unit [Line Items] |  |  |  |
Net income attributable to partners | $ 8,895 | $ 6,636 | $ 24,244 | $ 18,478
Less: General partner's distribution (including IDRs) | 8,892 | 6,688 | 24,475 | 18,598
Earnings in excess of (less than) distributions | 3 | (52) | (231) | (120)
Total partner's earnings | 8,895 | 6,636 | 24,244 | 18,478
Common unitholders | Common Units |  |  |  |
Net Income Per Unit [Line Items] |  |  |  |
Less: Partners' distribution | 21,487 | 19,272 | 62,256 | 56,343
Earnings in excess of (less than) distributions | 148 | (2,582) | (11,388) | (5,918)
Total partner's earnings | $ 21,635 | $ 16,690 | $ 50,868 | $ 50,425
Common units - (basic) (in shares) | 24,417,285 | 24,395,183 | 24,411,308 | 24,387,995
Common units - (diluted) (in shares) | 24,420,582 | 24,401,908 | 24,417,466 | 24,395,880
Common units - (basic) (in dollars per share) | $ 0.89 | $ 0.68 | $ 2.08 | $ 2.07
Common units - (diluted) (in dollars per share) | $ 0.89 | $ 0.68 | $ 2.08 | $ 2.07

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