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Net Income Per Unit (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The calculation of net income per unit for the year ended December 31, 2014, and the period subsequent to the Offering in 2013 is as follows:
 
Period Ended December 31,
 
2014
 
2013
 
(In thousands, except per unit data)
Net income attributable to partners
$
52,992

 
$
8,528

Limited partners' distributions on common units
(26,902
)
 
—

Limited partners' distributions on subordinated units
(26,534
)
 
—

 Distributions less than (greater than) earnings
$
(444
)
 
$
8,528

 
 
 
 
 Limited partners' earnings on common units:
 
 
 
 Distributions
$
26,902

 
$
—

 Allocation of distributions less than (greater than) earnings
(223
)
 
4,264

 Total limited partners' earnings on common units
$
26,679

 
$
4,264

 
 
 
 
 Limited partners' earnings on subordinated units:
 
 
 
 Distributions
$
26,534

 
$
—

 Allocation of distributions less than (greater than) earnings
(221
)
 
4,264

 Total limited partners' earnings on subordinated units
$
26,313

 
$
4,264

 
 
 
 
 Weighted average limited partner units outstanding:
 
 
 
 Common units - basic
23,059

 
22,811

 Common units - diluted
23,107

 
22,813

 Subordinated units - basic and diluted
22,811

 
22,811

 
 
 
 
 Net income per limited partner unit:
 
 
 
 Common - basic
$
1.16

 
$
0.19

 Common - diluted
1.15

 
0.19

 Subordinated - basic and diluted
1.15

 
0.19