Revenues (Tables)
 9 Months Ended
Sep. 30, 2019
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 September 30,
 
For the Nine Months Ended September 30,
 
2019
 
2018
 
2019

2018
Operating revenues (in thousands):
 
 
 
 
 
 
 
Oil sales
$
200,196

 
$
184,510

 
$
590,055

 
$
533,507

Natural gas sales
11,070

 
14,311

 
31,655

 
46,612

NGL sales
17,864

 
36,059

 
66,228

 
88,422

Oil and gas sales
$
229,130

 
$
234,880

 
$
687,938

 
$
668,541