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Equity Investment (Tables)
 12 Months Ended
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Summarized Financial Information
Our equity in the earnings of Ciner Wyoming is summarized as follows (in thousands):
 
For the Year Ended December 31,
 
2015
 
2014
 
2013
Income allocation to NRP’s equity interests
$
54,709

 
$
47,354

 
$
37,036

Amortization of basis difference
(4,791
)
 
(5,938
)
 
(2,850
)
Equity in earnings of unconsolidated investment
$
49,918

 
$
41,416

 
$
34,186



The results of Ciner Wyoming’s operations are summarized as follows (in thousands):
 
For the Year Ended December 31,
 
2015
 
2014
 
2013
Sales
$
486,393

 
$
465,032

 
$
442,132

Gross profit
131,493

 
118,439

 
94,299

Net Income
111,650

 
96,640

 
79,655



The financial position of Ciner Wyoming is summarized as follows (in thousands):
 
For the Year Ended December 31,
 
2015
 
2014
Current assets
$
144,695

 
$
179,851

Noncurrent assets
233,845

 
223,053

Current liabilities
43,018

 
47,704

Noncurrent liabilities
116,808

 
149,192