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Equity Method Investments (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
White Cliffs Pipeline, L.L.C.
$
12,688

 
$
14,338

 
$
26,625

 
$
26,943

NGL Energy Partners LP
7

 
13

 
21

 
22

Total earnings from equity method investments
$
12,695

 
$
14,351

 
$
26,646

 
$
26,965



Our equity method investments consisted of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
White Cliffs Pipeline, L.L.C.
$
265,200

 
$
255,043

NGL Energy Partners LP
18,986

 
18,966

Total equity method investments
$
284,186

 
$
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 six months ended June 30, 2019 and 2018, is shown below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Revenue
$
41,962

 
$
44,209

 
$
87,586

 
$
84,600

Costs of products sold, exclusive of depreciation and amortization
$
(228
)
 
$
(415
)
 
$
(7
)
 
$
(31
)
Operating, general and administrative expenses
$
8,047

 
$
6,594

 
$
16,859

 
$
11,997

Depreciation and amortization expense
$
9,265

 
$
9,606

 
$
18,528

 
$
19,197

Net income
$
24,878

 
$
28,423

 
$
52,206

 
$
53,437