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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Summarized Information on the Consolidated Results of Operations
Summarized information on our consolidated results of operations for the quarters during the year ended December 31, 2016 is shown below (in thousands, except per share amounts):
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Total revenues
$
314,851

 
$
287,377

 
$
327,764

 
$
402,172

 
$
1,332,164

Loss on disposal or impairment, net
13,307

 
1,685

 
1,018

 
38

 
16,048

Other operating costs and expenses
292,250

 
277,379

 
316,644

 
381,969

 
1,268,242

Total expenses
305,557

 
279,064

 
317,662

 
382,007

 
1,284,290

Earnings from equity method investments
23,071

 
17,078

 
15,845

 
17,763

 
73,757

Loss on issuance of common units by equity method investee
(41
)
 
—

 
—

 
—

 
(41
)
Operating income
32,324

 
25,391

 
25,947

 
37,928

 
121,590

Other expenses, net
58,622

 
9,944

 
18,684

 
9,809

 
97,059

Income (loss) from continuing operations before income taxes
(26,298
)
 
15,447

 
7,263

 
28,119

 
24,531

Income tax expense (benefit)
(21,407
)
 
4,658

 
11,898

 
16,119

 
11,268

Income (loss) from continuing operations
(4,891
)
 
10,789

 
(4,635
)
 
12,000

 
13,263

Income (loss) from discontinued operations, net of income taxes
(2
)
 
(2
)
 
3

 
—

 
(1
)
Net income (loss)
(4,893
)
 
10,787

 
(4,632
)
 
12,000

 
13,262

Less: net income attributable to noncontrolling interests
9,020

 
1,922

 
225

 
—

 
11,167

Net income (loss) attributable to SemGroup
$
(13,913
)
 
$
8,865

 
$
(4,857
)
 
$
12,000

 
$
2,095

Earnings (loss) per share—basic
$
(0.32
)
 
$
0.20

 
$
(0.09
)
 
$
0.18

 
$
0.04

Earnings (loss) per share—diluted
$
(0.32
)
 
$
0.19

 
$
(0.09
)
 
$
0.18

 
$
0.04

Summarized information on our consolidated results of operations for the quarters during the year ended December 31, 2017 is shown below (in thousands, except per share amounts):
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Total revenues
$
456,100

 
$
473,089

 
$
545,922

 
$
606,806

 
$
2,081,917

Loss (gain) on disposal or impairment, net
2,410

 
(234
)
 
41,625

 
(30,468
)
 
13,333

Other operating costs and expenses
447,324

 
465,807

 
546,263

 
579,055

 
2,038,449

Total expenses
449,734

 
465,573

 
587,888

 
548,587

 
2,051,782

Earnings from equity method investments
17,091

 
17,753

 
17,367

 
15,120

 
67,331

Operating income (loss)
23,457

 
25,269

 
(24,599
)
 
73,339

 
97,466

Other expenses, net
33,639

 
12,033

 
31,753

 
39,579

 
117,004

Income (loss) from continuing operations before income taxes
(10,182
)
 
13,236

 
(56,352
)
 
33,760

 
(19,538
)
Income tax expense (benefit)
95

 
3,625

 
(37,249
)
 
31,141

 
(2,388
)
Net income (loss)
$
(10,277
)
 
$
9,611

 
$
(19,103
)
 
$
2,619

 
$
(17,150
)
Earnings (loss) per share—basic
$
(0.16
)
 
$
0.15

 
$
(0.25
)
 
$
0.03

 
$
(0.24
)
Earnings (loss) per share—diluted
$
(0.16
)
 
$
0.15

 
$
(0.25
)
 
$
0.03

 
$
(0.24
)