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Equity Method Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]  
Schedule of equity method investments [Table Text Block] Our equity method investments consisted of the following (in thousands):
 
September 30, 2018
 
December 31, 2017
White Cliffs Pipeline, L.L.C.
$
258,098

 
$
266,362

NGL Energy Partners LP
18,923

 
18,919

Total equity method investments
$
277,021

 
$
285,281

Our earnings from equity method investments consisted of the following (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
White Cliffs Pipeline, L.L.C.
$
14,546

 
$
15,636

 
$
41,489

 
$
46,805

Glass Mountain Pipeline, LLC
—

 
1,736

 
—

 
5,402

NGL Energy Partners LP
(18
)
 
(5
)
 
4

 
4

Total earnings from equity method investments
$
14,528

 
$
17,367

 
$
41,493

 
$
52,211

Cash distributions received from equity method investments consisted of the following (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
White Cliffs Pipeline, L.L.C.
$
18,640

 
$
19,847

 
$
57,219

 
$
60,552

Glass Mountain Pipeline, LLC
—

 
3,410

 
—

 
10,350

Total cash distributions received from equity method investments
$
18,640

 
$
23,257

 
$
57,219

 
$
70,902
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, 2018 and 2017, is shown below (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Revenue
$
43,855

 
$
45,445

 
$
128,455

 
$
145,288

Cost of products sold, exclusive of depreciation and amortization
$
(107
)
 
$
(360
)
 
$
(138
)
 
$
8,091

Operating, general and administrative expenses
$
5,514

 
$
5,723

 
$
17,511

 
$
17,849

Depreciation and amortization expense
$
9,624

 
$
9,154

 
$
28,821

 
$
27,619

Net income
$
28,825

 
$
30,928

 
$
82,262

 
$
91,688