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Earnings per Unit (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2016 and 2015, respectively, is as follows:
 
Three Months Ended
 
March 31,
 
2016
 
2015
 
(In thousands, except per unit data)
Net income
$
14,007

 
$
13,411

Net loss attributable to General Partner (1)
—

 
(1,912
)
Net income attributable to limited partners
14,007

 
15,323

General Partner distributions
(761
)
 
(16
)
Limited partners' distributions on common units
(9,595
)
 
(7,974
)
Limited partners' distributions on subordinated units
(8,954
)
 
(7,585
)
 Distributions greater than earnings
$
(5,303
)
 
$
(252
)
 
 
 
 
General Partners' earnings:
 
 
 
Distributions
$
761

 
$
16

Net loss attributable to General Partner (1)
—

 
(1,912
)
 Total General Partners' earnings (loss)
$
761

 
$
(1,896
)
 
 
 
 
Limited partners' earnings on common units:
 
 
 
Distributions
$
9,595

 
$
7,974

Allocation of distributions greater than earnings
(2,743
)
 
(129
)
 Total limited partners' earnings on common units
$
6,852

 
$
7,845

 
 
 
 
Limited partners' earnings on subordinated units:
 
 
 
Distributions
$
8,954

 
$
7,585

Allocation of distributions greater than earnings
(2,560
)
 
(123
)
 Total limited partners' earnings on subordinated units
$
6,394

 
$
7,462

 
 
 
 
Weighted-average limited partner units outstanding:
 
 
 
 Common units - basic
24,448

 
23,985

 Common units - diluted
24,454

 
23,996

 Subordinated units - basic and diluted
22,811

 
22,811

 
 
 
 
Net income per limited partner unit:
 
 
 
 Common - basic
$
0.28

 
$
0.33

 Common - diluted
0.28

 
0.33

 Subordinated - basic and diluted
0.28

 
0.33

(1)
We apply the two-class method to calculate earnings per unit and allocate the results of operations of 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 this acquisition.