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Equity Method Investments (Tables)
 6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
White Cliffs Pipeline, L.L.C.
$
15,976

 
$
16,428

 
$
31,169

 
$
36,208

Glass Mountain Pipeline, LLC
1,771

 
650

 
3,666

 
1,709

NGL Energy Partners LP(1)
6

 
—

 
9

 
2,232

Total earnings from equity method investments
$
17,753

 
$
17,078

 
$
34,844

 
$
40,149

Cash distributions received from equity method investments consisted of the following (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
White Cliffs Pipeline, L.L.C.
$
22,514

 
$
21,664

 
$
40,704

 
$
45,762

Glass Mountain Pipeline, LLC
3,437

 
3,118

 
6,940

 
5,933

NGL Energy Partners LP
—

 
—

 
—

 
4,873

Total cash distributions received from equity method investments
$
25,951

 
$
24,782

 
$
47,644

 
$
56,568

Our equity method investments consisted of the following (in thousands):
 
June 30, 2017
 
December 31, 2016
White Cliffs Pipeline, L.L.C.
$
273,868

 
$
281,734

Glass Mountain Pipeline, LLC
137,704

 
133,622

NGL Energy Partners LP
18,942

 
18,933

Total equity method investments
$
430,514

 
$
434,289
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, 2017 and 2016, is shown below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Revenue
$
49,659

 
$
55,586

 
$
99,843

 
$
113,642

Cost of products sold, exclusive of depreciation and amortization shown below
$
4,338

 
$
2,803

 
$
8,451

 
$
3,053

Operating, general and administrative expenses
$
5,886

 
$
10,125

 
$
12,126

 
$
19,727

Depreciation and amortization expense
$
9,209

 
$
10,084

 
$
18,465

 
$
19,047

Net income
$
30,185

 
$
32,575

 
$
60,760

 
$
71,822
Glass Mountain Pipeline LLC [Member]  
Schedule of Equity Method Investments [Line Items]  
Schedule of equity method investments [Table Text Block]
Certain unaudited summarized income statement information of Glass Mountain for the three months and six months ended June 30, 2017 and 2016, is shown below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Revenue
$
9,822

 
$
6,898

 
$
21,514

 
$
15,470

Cost of products sold, exclusive of depreciation and amortization shown below
$
128

 
$
(120
)
 
$
2,026

 
$
445

Operating, general and administrative expenses
$
2,042

 
$
1,618

 
$
3,957

 
$
3,463

Depreciation and amortization expense
$
4,005

 
$
3,989

 
$
7,987

 
$
7,925

Net income
$
3,648

 
$
1,407

 
$
7,544

 
$
3,632