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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Summarized financial information concerning our reportable segments is as follows:
(in thousands)
 
Gathering Systems (1)
 
Fresh Water Delivery (1)
 
Investments and Other (1) (2)
 
Consolidated
Three Months Ended September 30, 2017
 
 
 
 
 
 
 
 
Midstream Services — Affiliate
 
$
39,166

 
$
17,589

 
$
—

 
$
56,755

Midstream Services — Third Party
 
1,574

 
4,782

 
—

 
6,356

Total Midstream Services Revenues
 
40,740

 
22,371

 
—

 
63,111

Income (Loss) Before Income Taxes
 
28,307

 
17,823

 
(2,341
)
 
43,789

 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
 
Midstream Services Revenues
 
$
25,887

 
$
21,280

 
$
—

 
$
47,167

Income (Loss) before Income Taxes
 
19,280

 
18,186

 
(3,994
)
 
33,472

 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
 
 
 
 
 
 
 
 
Midstream Services — Affiliate
 
$
102,930

 
$
58,256

 
$
—

 
$
161,186

Midstream Services — Third Party
 
1,574

 
8,448

 
—

 
10,022

Total Midstream Services Revenues
 
104,504

 
66,704

 
—

 
171,208

Income (Loss) Before Income Taxes 
 
70,633

 
53,298

 
(6,515
)
 
117,416

 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
Midstream Services Revenues
 
$
72,291

 
$
39,968

 
$
—

 
$
112,259

Income (Loss) Before Income Taxes
 
56,390

 
29,272

 
(7,063
)
 
78,599

 
 
 
 
 
 
 
 
 
September 30, 2017
 
 
 
 
 
 
 
 
Total Assets
 
$
459,647

 
$
66,839

 
$
117,605

 
$
644,091

 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
Total Assets
 
$
224,861

 
$
54,542

 
$
89,956

 
$
369,359

(1) 
A substantial portion of the financial statement activity associated with our DevCos is captured within the Gathering Systems and Fresh Water Delivery reportable segments. Although our investment in the Advantage Joint Venture is owned by Trinity River DevCo LLC, all financial statement activity associated with our investment is captured within the Investments and Other reportable segment. As our DevCos represent VIEs, see the above reportable segments for our VIEs impact to the consolidated financial statements.
(2) 
The Investments and Other segment includes our investments in the Advantage Joint Venture and White Cliffs Interest as well as all general Partnership activity not attributable to our DevCos.