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Equity Method Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Summary of Financial Information for Equity Method Investees
Combined summarized unaudited financial information for these two equity method investees on a 100% basis is shown below (in thousands):
 
June 30, 2019
 
December 31, 2018
Current assets
$
23,031

 
$
15,450

Non-current assets
$
255,690

 
$
240,852

Current liabilities
$
8,103

 
$
4,362

Non-current liabilities
$
11

 
$
—

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Revenues
$
10,077

 
$
9,886

 
$
19,191

 
$
17,876

Gross profit
$
5,688

 
$
5,245

 
$
10,584

 
$
8,479

Net Income
$
5,249

 
$
4,800

 
$
9,666

 
$
7,512


Summarized unaudited financial information for Red River on a 100% basis is shown below (in thousands):
 
June 30, 2019
 
December 31, 2018
Current Assets
$
8,783

 
$
6,594

Non-current Assets
$
375,416

 
$
375,618

Current liabilities
$
3,319

 
$
4,945

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Revenues
$
14,391

 
$
10,112

 
$
26,017

 
$
19,190

Gross profit
$
9,191

 
$
5,064

 
$
14,466

 
$
9,348

Net income
$
8,942

 
$
4,628

 
$
13,652

 
$
8,513