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Investment in Laramie Energy (Tables)
 12 Months Ended
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments
The change in our equity investment in Laramie Energy is as follows (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Beginning balance
$
108,823

 
$
76,203

 
$
104,657

Equity earnings (losses) from Laramie Energy
13,043

 
(28,198
)
 
(15,713
)
Accretion of basis difference
5,326

 
5,818

 
811

Impairment
—

 
—

 
(41,081
)
Investments
—

 
55,000

 
27,529

Ending balance
$
127,192

 
$
108,823

 
$
76,203
Equity Method Investees Financial Information
Summarized financial information for Laramie Energy is as follows (in thousands):
 
December 31,
 
2017
 
2016
Current assets
$
18,757

 
$
12,199

Non-current assets
720,444

 
655,022

Current liabilities
42,149

 
58,067

Non-current liabilities
237,497

 
186,631

 
 
Year Ended December 31,
 
2017
 
2016
 
2015
Natural gas and oil revenues
$
157,879

 
$
104,826

 
$
42,870

Income (loss) from operations
6,019

 
(27,325
)
 
(40,984
)
Net income (loss)
30,837

 
(61,849
)
 
(49,159
)