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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Related Party Transactions During the years ended December 31, 2018, 2017 and 2016, we generated the following transactions with related parties (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
NGL Energy
 
 
 
 
 
   Revenues
$
18,168

 
$
45,918

 
$
61,639

   Purchases
$
681

 
$
29,695

 
$
57,739

 
 
 


 
 
White Cliffs
 
 


 
 
   Crude oil revenues
$
—

 
$
436

 
$
4,973

   Storage revenues
$
4,350

 
$
4,350

 
$
4,350

   Transportation fees
$
12,506

 
$
11,298

 
$
10,797

   Management fees
$
545

 
$
519

 
$
494

   Crude oil purchases
$
6,201

 
$
11,870

 
$
4,758