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Earnings per Unit (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The calculation of net income per unit for the three and six months ended June 30, 2017 and 2016, respectively, is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands, except per unit data)
Net income
$
18,728

 
$
9,980

 
$
38,614

 
$
15,737

Net loss attributable to General Partner (1)
—

 
(7,894
)
 
—

 
(16,144
)
Net income attributable to limited partners
18,728

 
17,874

 
38,614

 
31,881

General Partner distributions
(3,981
)
 
(921
)
 
(7,044
)
 
(1,682
)
Limited partners' distributions on common units
(29,252
)
 
(9,858
)
 
(49,930
)
 
(19,453
)
Limited partners' distributions on subordinated units
—

 
(9,181
)
 
(6,992
)
 
(18,135
)
Distributions greater than earnings
$
(14,505
)
 
$
(2,086
)
 
$
(25,352
)
 
$
(7,389
)
 
 
 
 
 
 
 
 
General Partners' earnings:
 
 
 
 
 
 
 
Distributions
$
3,981

 
$
921

 
$
7,044

 
$
1,682

Net loss attributable to General Partner (1)
—

 
(7,894
)
 
—

 
(16,144
)
Total General Partners' earnings (loss)
$
3,981

 
$
(6,973
)
 
$
7,044

 
$
(14,462
)
 
 
 
 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
 
 
 
Distributions
$
29,252

 
$
9,858

 
$
49,930

 
$
19,453

Allocation of distributions greater than earnings
(14,505
)
 
(1,119
)
 
(22,205
)
 
(3,895
)
Total limited partners' earnings on common units
$
14,747

 
$
8,739

 
$
27,725

 
$
15,558

 
 
 
 
 
 
 
 
Limited partners' earnings on subordinated units (2):
 
 
 
 
 
 
 
Distributions
$
—

 
$
9,181

 
$
6,992

 
$
18,135

Allocation of distributions greater than earnings
—

 
(967
)
 
(3,147
)
 
(3,494
)
Total limited partners' earnings on subordinated units
$
—

 
$
8,214

 
$
3,845

 
$
14,641

 
 
 
 
 
 
 
 
Weighted-average limited partner units outstanding:
 
 
 
 
 
 
 
 Common units - basic
60,962

 
26,409

 
53,364

 
25,429

 Common units - diluted
60,971

 
26,427

 
53,372

 
25,441

 Subordinated units - basic and diluted
—

 
22,811

 
7,562

 
22,811

 
 
 
 
 
 
 
 
Net income per limited partner unit:
 
 
 
 
 
 
 
 Common - basic
$
0.24

 
$
0.33

 
$
0.52

 
$
0.61

 Common - diluted
0.24

 
0.33

 
0.52

 
0.61

 Subordinated - basic and diluted
—

 
0.36

 
0.51

 
0.64

(1)
We apply the two-class method to calculate earnings per unit and allocate the results of operations of the St. Paul Park Logistics Assets prior to the St. Paul Park Logistics Transaction entirely to our general partner. The limited partners had no rights to the results of operations before the acquisition.
(2)
On March 2, 2017, the 22,811,000 subordinated units converted into common units on a one-for-one basis and thereafter participated on terms equal with all other common units in distributions of available cash. Distributions greater than earnings were allocated to the subordinated units through March 2, 2017.