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Earnings per Unit (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2014, is as follows (in thousands, except per unit amounts):
Net income attributable to partners
$
10,933

Limited partners' distributions on common units
(5,491
)
Limited partners' distributions on subordinated units
(5,491
)
 Distributions less than (greater than) earnings
$
(49
)
 
 
 Limited partners' earnings on common units:
 
 Distributions
$
5,491

 Allocation of distributions less than (greater than) earnings
(25
)
 Total limited partners' earnings on common units
$
5,466

 
 
 Limited partners' earnings on subordinated units:
 
 Distributions
$
5,491

 Allocation of distributions less than (greater than) earnings
(24
)
 Total limited partners' earnings on subordinated units
$
5,467

 
 
 Weighted average limited partner units outstanding:
 
 Common units - basic
22,811

 Common units - diluted
22,815

 Subordinated units - basic and diluted
22,811

 
 
 Net income per limited partner unit:
 
 Common - basic
$
0.24

 Common - diluted
0.24

 Subordinated - basic and diluted
0.24