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Net Income Per Unit (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Summary of Cash Distributions The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Net income attributable to partners$43,624 $46,328 $123,137 $118,539 
Less: General partner's distribution (including IDRs) (1)
— — — 18,618 
Less: Limited partners' distribution41,286 39,307 122,100 87,536 
Earnings in excess (deficit) of distributions$2,338 $7,021 $1,037 $12,385 
General partner's earnings:
Distributions (including IDRs) (1)
$— $— $— $18,618 
Allocation of earnings in excess (deficit) of distributions— — — 106 
Total general partner's earnings$— $— $— $18,724 
Limited partners' earnings on common units:
Distributions$41,286 $39,307 $122,100 $87,536 
Allocation of earnings in excess (deficit) of distributions2,338 7,021 1,037 12,279 
Total limited partners' earnings on common units$43,624 $46,328 $123,137 $99,815 
Weighted average limited partner units outstanding:
Common units - basic43,454,535 36,889,761 43,447,739 30,290,051 
Common units - diluted 43,468,289 36,894,043 43,457,857 30,292,261 
Net income per limited partner unit:
Common units - basic$1.00 $1.26 $2.83 $3.30 
Common units - diluted (2)
$1.00 $1.26 $2.83 $3.30 
(1) Prior to August 13, 2020, general partner distributions (including IDRs) consisted of the 2.0% general partner interest and IDRs, which represented 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.
(2) There were no outstanding common units excluded from the diluted earnings per unit calculation for the three and nine months ended September 30, 2021 and 2020.