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Earnings per Unit (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2017 and 2016, respectively, is as follows:
 
Three Months Ended
 
March 31,
 
2017
 
2016
 
(In thousands, except per unit data)
Net income
$
19,886

 
$
5,757

Net loss attributable to General Partner (1)
—

 
(8,250
)
Net income attributable to limited partners
19,886

 
14,007

General Partner distributions
(2,147
)
 
(761
)
Limited partners' distributions on common units
(16,657
)
 
(9,595
)
Limited partners' distributions on subordinated units
(9,979
)
 
(8,954
)
Distributions greater than earnings
$
(8,897
)
 
$
(5,303
)
 
 
 
 
General Partners' earnings:
 
 
 
Distributions
$
2,147

 
$
761

Net loss attributable to General Partner (1)
—

 
(8,250
)
Total General Partners' earnings (loss)
$
2,147

 
$
(7,489
)
 
 
 
 
Limited partners' earnings on common units:
 
 
 
Distributions
$
16,657

 
$
9,595

Allocation of distributions greater than earnings
(6,675
)
 
(2,743
)
Total limited partners' earnings on common units
$
9,982

 
$
6,852

 
 
 
 
Limited partners' earnings on subordinated units (2):
 
 
 
Distributions
$
9,979

 
$
8,954

Allocation of distributions greater than earnings
(2,222
)
 
(2,560
)
Total limited partners' earnings on subordinated units
$
7,757

 
$
6,394

 
 
 
 
Weighted-average limited partner units outstanding:
 
 
 
 Common units - basic
45,681

 
24,448

 Common units - diluted
45,688

 
24,454

 Subordinated units - basic and diluted
15,207

 
22,811

 
 
 
 
Net income per limited partner unit:
 
 
 
 Common - basic
$
0.22

 
$
0.28

 Common - diluted
0.22

 
0.28

 Subordinated - basic and diluted
0.51

 
0.28

(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 held by Western 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.