Revenues (Tables)
6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Summary of Oil and Gas Revenues
Oil and gas revenues presented within the Consolidated Statements of Operations relate to the sale of oil, natural gas and NGLs as shown below:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2018
 
2017
 
2018

2017
Operating revenues (in thousands):
 
 
 
 
 
 
 
Oil sales
$
174,156

 
$
70,735

 
$
348,997

 
$
117,416

Natural gas sales
13,721

 
12,133

 
32,301

 
20,374

NGL sales
29,886

 
8,196

 
52,363

 
14,371

Oil and gas sales
$
217,763

 
$
91,064

 
$
433,661

 
$
152,161