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Earnings per Unit (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2014, is as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
2014
 
(In thousands, except per unit data)
Net income attributable to partners
$
12,265

 
$
34,173

Limited partners' distributions on common units
(7,014
)
 
(19,291
)
Limited partners' distributions on subordinated units
(7,014
)
 
(19,291
)
 Distributions greater than earnings
$
(1,763
)
 
$
(4,409
)
 
 
 
 
 Limited partners' earnings on common units:
 
 
 
 Distributions
$
7,014

 
$
19,291

 Allocation of distributions greater than earnings
(882
)
 
(2,205
)
 Total limited partners' earnings on common units
$
6,132

 
$
17,086

 
 
 
 
 Limited partners' earnings on subordinated units:
 
 
 
 Distributions
$
7,014

 
$
19,291

 Allocation of distributions greater than earnings
(881
)
 
(2,204
)
 Total limited partners' earnings on subordinated units
$
6,133

 
$
17,087

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

 
22,811

 Common units - diluted
22,883

 
22,853

 Subordinated units - basic and diluted
22,811

 
22,811

 
 
 
 
 Net income per limited partner unit:
 
 
 
 Common - basic
$
0.27

 
$
0.75

 Common - diluted
0.27

 
0.75

 Subordinated - basic and diluted
0.27

 
0.75