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Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Net Income Per Unit [Line Items] |  |
Net income attributable to partners | $ 27,796 | $ 19,696
Less: Partners' distribution | 21,739 | 20,014
Distributions in excess of earnings | $ (3,082) | $ (7,742)
Common units - (basic) (in shares) | 24,480,570 | 24,407,168
Common units - (diluted) (in shares) | 24,485,336 | 24,416,058
Common units - (basic) (in dollars per share) | $ 0.76 | $ 0.51
Common units - (diluted) (in dollars per share) | $ 0.76 | $ 0.51
General Partner |  |
Net Income Per Unit [Line Items] |  |
Net income attributable to partners | $ 9,077 | $ 7,270
Less: General partner's distribution (including IDRs) | 9,139 | 7,424
Distributions in excess of earnings | (62) | (154)
Total partner's earnings | 9,077 | 7,270
Common unitholders |  |
Net Income Per Unit [Line Items] |  |
Less: Partners' distribution | 21,739 | 20,014
Distributions in excess of earnings | $ (3,020) | $ (7,588)
Common units - (basic) (in shares) | 24,480,570 | 24,407,168
Common units - (diluted) (in shares) | 24,485,336 | 24,416,058
Common units - (basic) (in dollars per share) | $ 0.76 | $ 0.51
Common units - (diluted) (in dollars per share) | $ 0.76 | $ 0.51
Common unitholders | Common Units |  |
Net Income Per Unit [Line Items] |  |
Total partner's earnings | $ 18,719 | $ 12,426
Maximum |  |
Footnote [Abstract] |  |
Distribution Payment Targets | $ 0.43125 |
General Partnership [Member] |  |
Footnote [Abstract] |  |
General partner's ownership interest (as percent) | 2.00% | 2.00%

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