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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2019
Related Party Transactions [Abstract]  
Related Party Transactions
During the three months and six months ended June 30, 2019 and 2018, we generated the following transactions with related parties (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
NGL Energy
 
 
 
 
 
 
 
   Revenues
$
—

 
$
998

 
$
3,058

 
$
7,178

   Purchases
$
193

 
$
144

 
$
404

 
$
380

 
 
 
 
 
 
 
 
White Cliffs
 
 
 
 
 
 
 

   Storage revenues
$
1,200

 
$
1,088

 
$
2,288

 
$
2,176

   Transportation fees
$
2,714

 
$
2,697

 
$
5,732

 
$
6,320

   Management fees
$
139

 
$
133

 
$
279

 
$
266

   Crude oil purchases
$
—

 
$
—

 
$
—

 
$
895