| Schedule of investments accounted for by the equity method | 
Summarized results of operations:    
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   | 
December 31,  | 
 
   | 
2018  | 
   | 
2017  | 
   | 
2016  | 
 
   | 
(In thousands)  | 
 
Gross revenue  | 
$  | 
1,729,778  | 
 
  | 
   | 
$  | 
755,374  | 
 
  | 
   | 
$  | 
287,733  | 
 
  | 
 
Net income (loss)  | 
$  | 
253,451  | 
 
  | 
   | 
$  | 
(37,102  | 
)  | 
   | 
$  | 
(65,070  | 
)  | 
 
  
  
Summarized balance sheet information:    
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   | 
December 31,  | 
 
   | 
2018  | 
   | 
2017  | 
 
   | 
(In thousands)  | 
 
Current assets  | 
$  | 
471,733  | 
 
  | 
   | 
$  | 
415,032  | 
 
  | 
 
Noncurrent assets  | 
$  | 
1,302,488  | 
 
  | 
   | 
$  | 
1,542,090  | 
 
  | 
 
Current liabilities  | 
$  | 
239,975  | 
 
  | 
   | 
$  | 
261,086  | 
 
  | 
 
Noncurrent liabilities  | 
$  | 
94,575  | 
 
  | 
   | 
$  | 
148,839  | 
 
  | 
 
  
  
Investments accounted for by the equity method consist of the following as of December 31, 2018 and 2017:
 
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Carrying Value  | 
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(Income) loss from equity method investments  | 
 
   | 
Approximate Ownership %  | 
   | 
December 31,  | 
   | 
For the Year Ended December 31,  | 
 
   | 
   | 
2018  | 
   | 
2017  | 
   | 
2018  | 
   | 
2017  | 
   | 
2016  | 
 
   | 
   | 
   | 
(In thousands)  | 
 
Investment in Tatex Thailand II, LLC  | 
23.5  | 
%  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
(241  | 
)  | 
   | 
$  | 
(549  | 
)  | 
   | 
$  | 
(412  | 
)  | 
 
Investment in Tatex Thailand III, LLC  | 
—  | 
%  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
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   | 
(183  | 
)  | 
   | 
—  | 
 
  | 
 
Investment in Grizzly Oil Sands ULC  | 
24.9999  | 
%  | 
   | 
44,259  | 
 
  | 
   | 
57,641  | 
 
  | 
   | 
510  | 
 
  | 
   | 
2,189  | 
 
  | 
   | 
25,150  | 
 
  | 
 
Investment in Timber Wolf Terminals LLC(3)
  | 
—  | 
%  | 
   | 
—  | 
 
  | 
   | 
983  | 
 
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   | 
536  | 
 
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   | 
8  | 
 
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   | 
8  | 
 
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Investment in Windsor Midstream LLC  | 
22.5  | 
%  | 
   | 
39  | 
 
  | 
   | 
30  | 
 
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   | 
(9  | 
)  | 
   | 
25,233  | 
 
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   | 
(13,618  | 
)  | 
 
Investment in Stingray Cementing LLC(1)
  | 
—  | 
%  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
205  | 
 
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   | 
263  | 
 
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Investment in Blackhawk Midstream LLC(4)
  | 
—  | 
%  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(38  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
 
Investment in Stingray Energy Services LLC(1)
  | 
—  | 
%  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
282  | 
 
  | 
   | 
1,044  | 
 
  | 
 
Investment in Sturgeon Acquisitions LLC(1)
  | 
—  | 
%  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
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   | 
(71  | 
)  | 
   | 
993  | 
 
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Investment in Mammoth Energy Services, Inc.(1)
  | 
21.9  | 
%  | 
   | 
191,823  | 
 
  | 
   | 
165,715  | 
 
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   | 
(49,969  | 
)  | 
   | 
(11,288  | 
)  | 
   | 
24,037  | 
 
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Investment in Strike Force Midstream LLC(2)
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—  | 
%  | 
   | 
—  | 
 
  | 
   | 
77,743  | 
 
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(693  | 
)  | 
   | 
1,954  | 
 
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   | 
(89  | 
)  | 
 
   | 
   | 
   | 
$  | 
236,121  | 
 
  | 
   | 
$  | 
302,112  | 
 
  | 
   | 
$  | 
(49,904  | 
)  | 
   | 
$  | 
17,780  | 
 
  | 
   | 
$  | 
37,376  | 
 
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(1)  | 
 On June 5, 2017, Mammoth Energy Services, Inc. ("Mammoth Energy") acquired Stingray Cementing LLC, Stingray Energy Services LLC and Sturgeon Acquisitions LLC.  See below under Mammoth Energy Partners LP/Mammoth Energy Services, Inc. for information regarding these transactions. 
  
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(2)  | 
On May 1, 2018, the Company sold its 25% interest in Strike Force Midstream to EQT Midstream Partners, LP.  See below under under Strike Force Midstream LLC for information regarding this transaction.  
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(3)  | 
On June 5, 2018, the Company received its final distribution from Timber Wolf Terminals LLC ("Timber Wolf").  See below under Timber Wolf Terminals LLC for information regarding this distribution. 
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(4)  | 
On December 31, 2018, the Company received its final distribution from Blackhawk Midstream LLC ("Blackhawk").  See below under Blackhawk Midstream LLC for information regarding this distribution. 
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