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Earnings Per Unit (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The calculation of net income per unit for the years ended December 31, 2016, 2015 and 2014 is as follows:
 
Period Ended December 31,
 
2016
 
2015
 
2014
 
(In thousands, except per unit data)
Net income
$
43,347

 
$
32,706

 
$
32,908

Net loss attributable to General Partner (1)
(23,309
)
 
(29,867
)
 
(20,084
)
Net income attributable to limited partners
66,656

 
62,573

 
52,992

Distributions on TexNew Mex Units (2)
—

 
(310
)
 
—

General Partner distributions
(4,447
)
 
(1,085
)
 
—

Limited partners' distributions on common units
(47,453
)
 
(34,436
)
 
(26,902
)
Limited partners' distributions on subordinated units
(37,182
)
 
(32,563
)
 
(26,534
)
Distributions greater than earnings
$
(22,426
)
 
$
(5,821
)
 
$
(444
)
 
 
 
 
 
 
General Partners' earnings:
 
 
 
 
 
Distributions
$
4,447

 
$
1,085

 
$
—

Net loss attributable to General Partner (1)
(23,309
)
 
(29,867
)
 
(20,084
)
Total General Partners' loss
$
(18,862
)
 
$
(28,782
)
 
$
(20,084
)
 
 
 
 
 
 
 Limited partners' earnings on common units:
 
 
 
 
 
 Distributions
$
47,453

 
$
34,436

 
$
26,902

Allocation of distributions greater than earnings
(12,736
)
 
(2,990
)
 
(223
)
Total limited partners' earnings on common units
$
34,717

 
$
31,446

 
$
26,679

 
 
 
 
 
 
 Limited partners' earnings on subordinated units:
 
 
 
 
 
 Distributions
$
37,182

 
$
32,563

 
$
26,534

Allocation of distributions greater than earnings
(9,690
)
 
(2,831
)
 
(221
)
Total limited partners' earnings on subordinated units
$
27,492

 
$
29,732

 
$
26,313

 
 
 
 
 
 
 Weighted average limited partner units outstanding:
 
 
 
 
 
 Common units - basic
29,979

 
24,084

 
23,059

 Common units - diluted
29,994

 
24,099

 
23,107

 Subordinated units - basic and diluted
22,811

 
22,811

 
22,811

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

 
$
1.31

 
$
1.16

 Common - diluted
1.16

 
1.30

 
1.15

 Subordinated - basic and diluted
1.21

 
1.30

 
1.15

(1)
We apply the two-class method to calculate earnings per unit and allocate the results of operations of WRW, the TexNew Mex Pipeline System and the St. Paul Park Logistics Assets prior to the respective acquisitions entirely to our general partner. The limited partners had no rights to the results of operations before these acquisitions.
(2)
The TexNew Mex Units entitle Western to participate in 80% of the operating results attributable to the TexNew Mex Shared Segment resulting from crude oil throughput on the TexNew Mex pipeline above 13,000 barrels per day. See Note 3, Acquisitions, for further information.