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Partners' Capital (Tables)
 6 Months Ended
Jun. 30, 2015
Partners' Capital (Abstract)  
Partnership Units (Table Text Block)
 
 
 
 
 
 
 
 
 
  
As of June 30,
2015
 
    
As of December 31,
2014
Limited partner units
  
 
119,559,456
  
    
 
104,079,960
General partner units
  
 
2,439,989
  
    
 
2,124,081
Preferred partner units
  
 
12,983,333
  
    
 
14,223,737
Total partnership units
  
 
134,982,778
  
    
 
120,427,778 
 
 
 
 
 
 
 
 
Distribution to unitholders (Table Text Block)
 
 
 
 
 
 
April 23, 2015
January 23, 2015
April 22, 2014
January 22, 2014
Common unit-holders
 
 
 
 
Distributions per common unit declared
0.2345
0.2325
0.2325
0.2325
Common units entitled to distribution
119,559,456
104,079,960
88,490,710
88,440,710
General partner and IDR distributions
$572
$494
$ 411
$ 410
Preferred unit-holders
 
 
 
 
Distributions per preferred unit declared
0.21575
0.21375
0.21375
0.21375
Preferred units entitled to distribution
12,983,333
14,223,737
18,872,221
18,922,211