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Earnings per Unit (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2016 and 2015, respectively, is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands, except per unit data)
Net income
$
17,874

 
$
14,653

 
$
31,881

 
$
28,064

Net loss attributable to General Partner (1)
—

 
(1,262
)
 
—

 
(3,174
)
Net income attributable to limited partners
17,874

 
15,915

 
31,881

 
31,238

General Partner distributions
(921
)
 
(139
)
 
(1,682
)
 
(155
)
Limited partners' distributions on common units
(9,858
)
 
(8,346
)
 
(19,453
)
 
(16,320
)
Limited partners' distributions on subordinated units
(9,181
)
 
(7,927
)
 
(18,135
)
 
(15,512
)
 Distributions greater than earnings
$
(2,086
)
 
$
(497
)
 
$
(7,389
)
 
$
(749
)
 
 
 
 
 
 
 
 
General Partners' earnings:
 
 
 
 
 
 
 
Distributions
$
921

 
$
139

 
$
1,682

 
$
155

Net loss attributable to General Partner (1)
—

 
(1,262
)
 
—

 
(3,174
)
 Total General Partners' earnings (loss)
$
921

 
$
(1,123
)
 
$
1,682

 
$
(3,019
)
 
 
 
 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
 
 
 
Distributions
$
9,858

 
$
8,346

 
$
19,453

 
$
16,320

Allocation of distributions greater than earnings
(1,119
)
 
(255
)
 
(3,895
)
 
(384
)
 Total limited partners' earnings on common units
$
8,739

 
$
8,091

 
$
15,558

 
$
15,936

 
 
 
 
 
 
 
 
Limited partners' earnings on subordinated units:
 
 
 
 
 
 
 
Distributions
$
9,181

 
$
7,927

 
$
18,135

 
$
15,512

Allocation of distributions greater than earnings
(967
)
 
(242
)
 
(3,494
)
 
(365
)
 Total limited partners' earnings on subordinated units
$
8,214

 
$
7,685

 
$
14,641

 
$
15,147

 
 
 
 
 
 
 
 
Weighted-average limited partner units outstanding:
 
 
 
 
 
 
 
 Common units - basic
26,409

 
24,017

 
25,429

 
24,001

 Common units - diluted
26,427

 
24,051

 
25,441

 
24,023

 Subordinated units - basic and diluted
22,811

 
22,811

 
22,811

 
22,811

 
 
 
 
 
 
 
 
Net income per limited partner unit:
 
 
 
 
 
 
 
 Common - basic
$
0.33

 
$
0.34

 
$
0.61

 
$
0.66

 Common - diluted
0.33

 
0.34

 
0.61

 
0.66

 Subordinated - basic and diluted
0.36

 
0.34

 
0.64

 
0.66

(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.