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Earnings per Unit (Tables)
 9 Months Ended
Sep. 30, 2016
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 nine months ended September 30, 2016 and 2015, respectively, is as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands, except per unit data)
Net income
$
6,858

 
$
12,233

 
$
22,595

 
$
24,735

Net loss attributable to General Partner (1)
(7,165
)
 
(4,260
)
 
(23,309
)
 
(22,996
)
Net income attributable to limited partners
14,023

 
16,493

 
45,904

 
47,731

General Partner distributions
(1,175
)
 
(326
)
 
(2,857
)
 
(481
)
Limited partners' distributions on common units
(11,913
)
 
(8,766
)
 
(31,366
)
 
(25,086
)
Limited partners' distributions on subordinated units
(9,409
)
 
(8,326
)
 
(27,544
)
 
(23,838
)
Distributions greater than earnings
$
(8,474
)
 
$
(925
)
 
$
(15,863
)
 
$
(1,674
)
 
 
 
 
 
 
 
 
General Partners' earnings:
 
 
 
 
 
 
 
Distributions
$
1,175

 
$
326

 
$
2,857

 
$
481

Net loss attributable to General Partner (1)
(7,165
)
 
(4,260
)
 
(23,309
)
 
(22,996
)
Total General Partners' loss
$
(5,990
)
 
$
(3,934
)
 
$
(20,452
)
 
$
(22,515
)
 
 
 
 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
 
 
 
Distributions
$
11,913

 
$
8,766

 
$
31,366

 
$
25,086

Allocation of distributions greater than earnings
(4,874
)
 
(474
)
 
(8,636
)
 
(858
)
Total limited partners' earnings on common units
$
7,039

 
$
8,292

 
$
22,730

 
$
24,228

 
 
 
 
 
 
 
 
Limited partners' earnings on subordinated units:
 
 
 
 
 
 
 
Distributions
$
9,409

 
$
8,326

 
$
27,544

 
$
23,838

Allocation of distributions greater than earnings
(3,600
)
 
(451
)
 
(7,227
)
 
(816
)
Total limited partners' earnings on subordinated units
$
5,809

 
$
7,875

 
$
20,317

 
$
23,022

 
 
 
 
 
 
 
 
Weighted-average limited partner units outstanding:
 
 
 
 
 
 
 
 Common units - basic
30,884

 
24,017

 
27,260

 
24,006

 Common units - diluted
30,901

 
24,024

 
27,274

 
24,024

 Subordinated units - basic and diluted
22,811

 
22,811

 
22,811

 
22,811

 
 
 
 
 
 
 
 
Net income per limited partner unit:
 
 
 
 
 
 
 
 Common - basic
$
0.23

 
$
0.35

 
$
0.83

 
$
1.01

 Common - diluted
0.23

 
0.35

 
0.83

 
1.01

 Subordinated - basic and diluted
0.25

 
0.35

 
0.89

 
1.01

(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 and the TexNew Mex Pipeline System prior to the TexNew Mex Pipeline Acquisition entirely to our general partner. The limited partners had no rights to the results of operations before these acquisitions.