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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2018
Related Party Transactions [Abstract]  
Related Party Transactions During the three months and nine months ended September 30, 2018 and 2017, we generated the following transactions with related parties (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
NGL Energy
 
 
 
 
 
 
 
   Revenues
$
6,835

 
$
15,652

 
$
14,013

 
$
40,368

   Purchases
$
128

 
$
12,414

 
$
508

 
$
29,562

 
 
 
 
 
 
 
 
White Cliffs
 
 
 
 
 
 
 
   Crude oil revenues
$
—

 
$
—

 
$
—

 
$
436


   Storage revenues
$
1,088

 
$
1,087

 
$
3,264

 
$
3,263

   Transportation fees
$
3,135

 
$
3,111

 
$
9,455

 
$
8,152

   Management fees
$
140

 
$
133

 
$
406

 
$
387

   Crude oil purchases
$
2,834

 
$
—

 
$
3,729

 
$
8,616