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Net Income Per Unit (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Summary of Cash Distributions Our distributions earned with respect to a given period are declared subsequent to quarter end. Therefore, the table below represents total cash distributions applicable to the period in which the distributions are earned. The expected date of distribution for the distributions earned during the period ended March 31, 2019 is May 14, 2019. The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
 
 
Three Months Ended
 
 
March 31,
 
 
2019
 
2018
Net income attributable to partners
 
$
19,696

 
$
19,995

Less: General partner's distribution (including IDRs) (1)
 
7,424

 
5,710

Less: Limited partners' distribution
 
20,014

 
18,287

Distributions in excess of earnings
 
$
(7,742
)
 
$
(4,002
)
 
 
 
 
 
General partner's earnings:
 
 
 
 
Distributions (including IDRs) (1)
 
$
7,424

 
$
5,710

Allocation of distributions in excess of earnings
 
(154
)
 
(80
)
Total general partner's earnings
 
$
7,270

 
$
5,630

 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
Distributions
 
$
20,014

 
$
18,287

Allocation of distributions in excess of earnings
 
(7,588
)
 
(3,922
)
Total limited partners' earnings on common units
 
$
12,426

 
$
14,365

 
 
 
 
 
Weighted average limited partner units outstanding (2):
 
 
 
 
Common units - (basic)
 
24,407,168

 
24,382,633

Common units - (diluted)
 
24,416,058

 
24,393,746

 
 
 
 
 
Net income per limited partner unit (2):
 
 
 
 
Common units - (basic)
 
$
0.51

 
$
0.59

Common units - (diluted) (3) 
 
$
0.51

 
$
0.59


(1) General partner distributions (including IDRs) consist of the 2.0% 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. See Note 8 for further discussion related to IDRs.
(2) We base our calculation of net income per unit on the weighted-average number of common limited partner units outstanding during the period.
(3) There were no outstanding common units excluded from the diluted earnings per unit calculation for the three months ended March 31, 2019 and 2018