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Earnings per Unit (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 and 2014, respectively, is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
 
(In thousands, except per unit data)
Net income
$
15,915

 
$
17,060

 
$
31,238

 
$
33,384

Net income attributable to general partner (1)
—

 
6,085

 
—

 
11,476

Net income attributable to limited partners
15,915

 
10,975

 
31,238

 
21,908

General partner distributions
(139
)
 
—

 
(155
)
 
—

Limited partners' distributions on common units
(8,346
)
 
(6,786
)
 
(16,320
)
 
(12,277
)
Limited partners' distributions on subordinated units
(7,927
)
 
(6,786
)
 
(15,512
)
 
(12,277
)
 Distributions less than (greater than) earnings
$
(497
)
 
$
(2,597
)
 
$
(749
)
 
$
(2,646
)
 
 
 
 
 
 
 
 
General partners' earnings:
 
 
 
 
 
 
 
 Distributions
$
139

 
$
—

 
$
155

 
$
—

 Allocation of distributions less than (greater than) earnings
—

 
6,085

 
—

 
11,476

 Total general partners' earnings
$
139

 
$
6,085

 
$
155

 
$
11,476

 
 
 
 
 
 
 
 
Limited partners' earnings on common units:
 
 
 
 
 
 
 
 Distributions
$
8,346

 
$
6,786

 
$
16,320

 
$
12,277

 Allocation of distributions less than (greater than) earnings
(255
)
 
(1,298
)
 
(384
)
 
(1,323
)
 Total limited partners' earnings on common units
$
8,091

 
$
5,488

 
$
15,936

 
$
10,954

 
 
 
 
 
 
 
 
Limited partners' earnings on subordinated units:
 
 
 
 
 
 
 
 Distributions
$
7,927

 
$
6,786

 
$
15,512

 
$
12,277

 Allocation of distributions less than (greater than) earnings
(242
)
 
(1,299
)
 
(365
)
 
(1,323
)
 Total limited partners' earnings on subordinated units
$
7,685

 
$
5,487

 
$
15,147

 
$
10,954

 
 
 
 
 
 
 
 
Weighted average limited partner units outstanding:
 
 
 
 
 
 
 
 Common units - basic
24,017

 
22,811

 
24,001

 
22,811

 Common units - diluted
24,051

 
22,861

 
24,023

 
22,838

 Subordinated units - basic and diluted
22,811

 
22,811

 
22,811

 
22,811

 
 
 
 
 
 
 
 
Net income per limited partner unit:
 
 
 
 
 
 
 
 Common - basic
$
0.34

 
$
0.24

 
$
0.66

 
$
0.48

 Common - diluted
0.34

 
0.24

 
0.66

 
0.48

 Subordinated - basic and diluted
0.34

 
0.24

 
0.66

 
0.48

(1)
For historical periods prior to the Wholesale Acquisition, we have applied the two-class method to calculate earnings per unit. The net income of WRW prior to the Wholesale Acquisition was allocated entirely to the general partner.