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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
All goodwill is attributed to the Midstream reportable segment. Changes in the carrying amount of goodwill consist of the following activity:
December 31, 2017
$
—

Acquisitions
796,359

March 31, 2018
$
796,359
Schedule of Finite-Lived Intangible Assets
The carrying amount and accumulated amortization of other intangible assets consist of the following:
 
March 31, 2018
 
December 31, 2017
Other Intangible Assets
 
 
 
Customer Relationships
$
128,781

 
$
—

Less: accumulated amortization for customer relationships
(1,922
)
 
—

Total other intangible assets, net
$
126,859

 
$
—
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The estimated future annual amortization expense for the next five fiscal years for other intangible assets recorded at March 31, 2018 is as follows:
 
2019
 
2020
 
2021
 
2022
 
2023
Estimated annual amortization expense
$
7,688

 
$
7,688

 
$
7,688

 
$
7,688

 
$
7,688