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Net Income Per Unit (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30, 2018 is August 13, 2018. The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
Net income attributable to partners
 
$
25,582

 
$
18,977

 
$
45,577

 
$
33,572

Less: General partner's distribution (including IDRs) (1)
 
6,200

 
4,608

 
11,910

 
8,845

Less: Limited partners' distribution
 
18,784

 
17,175

 
37,071

 
33,962

Earnings in excess (deficit) of distributions
 
$
598

 
$
(2,806
)
 
$
(3,404
)
 
$
(9,235
)
 
 
 
 
 
 
 
 
 
General partner's earnings:
 
 
 
 
 
 
 
 
Distributions (including IDRs) (1)
 
$
6,200

 
$
4,608

 
$
11,910

 
$
8,845

Allocation of earnings in excess (deficit) of distributions
 
12

 
(56
)
 
(68
)
 
(184
)
Total general partner's earnings
 
$
6,212

 
$
4,552

 
$
11,842

 
$
8,661

 
 
 
 
 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
 
 
 
 
Distributions
 
$
18,784

 
$
17,175

 
$
37,071

 
$
33,962

Allocation of earnings in excess (deficit) of distributions
 
586

 
(2,750
)
 
(3,336
)
 
(9,051
)
Total limited partners' earnings on common units
 
$
19,370

 
$
14,425

 
$
33,735

 
$
24,911

 
 
 
 
 
 
 
 
 
Weighted average limited partner units outstanding (2):
 
 
 
 
 
 
 
 
Common units - (basic)
 
24,386,031

 
24,335,338

 
24,384,341

 
24,331,991

Common units - (diluted)
 
24,394,103

 
24,375,946

 
24,391,760

 
24,371,540

 
 
 
 
 
 
 
 
 
Net income per limited partner unit (2):
 
 
 
 
 
 
 
 
Common units - (basic)
 
$
0.79

 
$
0.59

 
$
1.38

 
$
1.02

Common units - (diluted)
 
$
0.79

 
$
0.59

 
$
1.38

 
$
1.02


            

(1) 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. See Note 9 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.