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Net Income Per Unit (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Income Per Unit The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
Year Ended December 31,
202020192018
Net income attributable to partners$159,256 $96,749 $90,182 
Less: General partner's distribution (including IDRs) (1)
18,618 33,492 25,777 
Less: Limited partners' distribution127,070 83,873 76,113 
Earning in excess (deficit) of distributions$13,568 $(20,616)$(11,708)
General partner's earnings:
Distributions (including IDRs) (1)
$18,618 $33,492 $25,777 
Allocation of earnings in excess (deficit) of distributions106 (412)(234)
Total general partner's earnings$18,724 $33,080 $25,543 
Limited partners' earnings on common units:
Distributions$127,070 $83,873 $76,113 
Allocation of earnings in excess (deficit) of distributions13,462 (20,204)(11,474)
Total limited partners' earnings on common units$140,532 $63,669 $64,639 
Weighted average limited partner units outstanding:
Common units - basic33,594,284 24,413,294 24,390,286 
Common units - diluted33,597,418 24,418,641 24,396,881 
Net income per limited partner unit:
Common - basic$4.18 $2.61 $2.65 
Common - diluted (2)
$4.18 $2.61 $2.65 
(1) Prior to August 13, 2020, 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. In connection with the IDR Restructuring Transaction on August 13, 2020, the IDRs were eliminated and the general partner interest became a non-economic general partner interest. See Note 12 for further discussion related to IDRs.
(2) There were 5,201 and 1,776 outstanding common unit equivalents excluded from the diluted earnings per unit calculation during both years ended December 31, 2020 and 2018. There were no outstanding common unit equivalents excluded from the diluted earnings per unit calculation for the year ended December 31, 2019, as these common unit equivalents did not have a dilutive effect under the treasury stock method.