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Net Income Per Unit (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2021202020212020
Net income attributable to partners$43,246 $44,415 $79,513 $72,211 
Less: General partner's distribution (including IDRs) (1)
— 9,479 — 18,618 
Less: Limited partners' distribution40,846 26,490 80,814 48,229 
Earnings in excess (deficit) of distributions$2,400 $8,446 $(1,301)$5,364 
General partner's earnings:
Distributions (including IDRs) (1)
$— $9,479 $— $18,618 
Allocation of earnings in excess (deficit) of distributions— 168 — 106 
Total general partner's earnings$— $9,647 $— $18,724 
Limited partners' earnings on common units:
Distributions$40,846 $26,490 $80,814 $48,229 
Allocation of earnings in excess (deficit) of distributions2,400 8,278 (1,301)5,258 
Total limited partners' earnings on common units$43,246 $34,768 $79,513 $53,487 
Weighted average limited partner units outstanding:
Common units - basic43,445,222 29,427,298 43,444,284 26,953,934 
Common units - diluted 43,460,366 29,430,555 43,453,806 26,956,523 
Net income per limited partner unit:
Common units - basic$1.00 $1.18 $1.83 $1.98 
Common units - diluted (2)
$1.00 $1.18 $1.83 $1.98 
(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) Outstanding common units totaling 3,662 and 1,841 were excluded from the diluted earnings per unit calculation for the three and six months ended June 30, 2021, respectively. Outstanding common units totaling 18,270 were excluded from the diluted earnings per unit calculation for both the three and six months ended June 30, 2020.