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Equity Method Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]  
Schedule of equity method investments [Table Text Block]
Our earnings from equity method investments consisted of the following (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
White Cliffs Pipeline, L.L.C.
$
9,075

 
$
14,546

 
$
35,700

 
$
41,489

NGL Energy Partners LP
(10
)
 
(18
)
 
11

 
4

Total earnings from equity method investments
$
9,065

 
$
14,528

 
$
35,711

 
$
41,493



Our equity method investments consisted of the following (in thousands):
 
September 30, 2019
 
December 31, 2018
White Cliffs Pipeline, L.L.C.
$
264,662

 
$
255,043

NGL Energy Partners LP
18,976

 
18,966

Total equity method investments
$
283,638

 
$
274,009
White Cliffs Pipeline, L.L.C. [Member]  
Schedule of Equity Method Investments [Line Items]  
Schedule of equity method investments [Table Text Block] Certain unaudited summarized income statement information of White Cliffs for the three months and nine months ended September 30, 2019 and 2018, is shown below (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Revenue
$
32,420

 
$
43,855

 
$
120,006

 
$
128,455

Costs of products sold, exclusive of depreciation and amortization
$
(345
)
 
$
(107
)
 
$
(352
)
 
$
(138
)
Operating, general and administrative expenses
$
5,907

 
$
5,514

 
$
22,766

 
$
17,511

Depreciation and amortization expense
$
9,064

 
$
9,624

 
$
27,592

 
$
28,821

Net income
$
17,794

 
$
28,825

 
$
70,000

 
$
82,262