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Equity Method Investments (Tables)
 6 Months Ended
Jun. 30, 2016
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):
 
June 30, 2016
 
December 31, 2015
White Cliffs Pipeline, L.L.C.
$
290,668

 
$
297,109

NGL Energy Partners LP
18,977

 
112,787

Glass Mountain Pipeline, LLC
137,293

 
141,182

Total equity method investments
$
446,938

 
$
551,078
Earnings from 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,
 
2016
 
2015
 
2016
 
2015
White Cliffs Pipeline, L.L.C.
$
16,428

 
$
15,545

 
$
36,208

 
$
34,635

NGL Energy Partners LP(1)
—

 
6,220

 
2,232

 
5,915

Glass Mountain Pipeline, LLC
650

 
2,138

 
1,709

 
3,912

Total earnings from equity method investments
$
17,078

 
$
23,903

 
$
40,149

 
$
44,462


(1) Excluding loss on issuance of common units of $41.0 thousand for the six months ended June 30, 2016 and a gain on the issuance of common units of $5.9 million for the three and six months ended June 30, 2015. Additionally, gains and losses on the disposal or impairment of equity investments are not reported within "earnings from equity method investments" in the condensed consolidated statements of operations and comprehensive income (loss).
Cash distributions received from equity method investments [Table Text Block]
Cash distributions received from equity method investments consisted of the following (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
White Cliffs Pipeline, L.L.C.
$
21,664

 
$
20,551

 
$
45,762

 
$
44,705

NGL Energy Partners LP
—

 
4,468

 
4,873

 
9,483

Glass Mountain Pipeline, LLC
3,118

 
5,009

 
5,933

 
6,920

Total cash distributions received from equity method investments
$
24,782

 
$
30,028

 
$
56,568

 
$
61,108
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 Pipeline, L.L.C. ("White Cliffs") for the three months and six months ended June 30, 2016 and 2015 is shown below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Revenue
$
55,586

 
$
48,509

 
$
113,642

 
$
103,123

Cost of products sold
$
2,803

 
$
169

 
$
3,053

 
$
1,102

Operating, general and administrative expenses
$
10,125

 
$
8,876

 
$
19,727

 
$
16,296

Depreciation and amortization expense
$
10,084

 
$
8,587

 
$
19,047

 
$
17,125

Net income
$
32,575

 
$
30,870

 
$
71,822

 
$
68,593
NGL Energy Partners LP [Member]  
Schedule of Equity Method Investments [Line Items]  
Schedule of equity method investments [Table Text Block]
Certain unaudited summarized income statement information of NGL Energy for the three months and six months ended March 31, 2016 and 2015 is shown below (in thousands):
 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2016
 
2015
 
2016
 
2015
Revenue
$
2,325,440

 
$
3,220,771

 
$
5,010,446

 
$
7,772,917

Cost of sales
$
2,077,160

 
$
2,933,021

 
$
4,510,660

 
$
7,244,689

Operating, general and administrative expenses
$
399,373

 
$
151,793

 
$
509,145

 
$
323,857

Depreciation and amortization expense
$
53,152

 
$
54,140

 
$
112,332

 
$
104,475

Net income (loss)
$
(206,985
)
 
$
90,942

 
$
(155,990
)
 
$
85,673

 
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, 2016 and 2015 is shown below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Revenue
$
6,898

 
$
9,788

 
$
15,470

 
$
20,909

Cost of sales
$
(120
)
 
$
(40
)
 
$
445

 
$
1,974

Operating, general and administrative expenses
$
1,618

 
$
1,513

 
$
3,463

 
$
2,920

Depreciation and amortization expense
$
3,989

 
$
3,932

 
$
7,925

 
$
7,976

Net income
$
1,407

 
$
4,381

 
$
3,632

 
$
8,036