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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Other Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
Our identifiable intangible assets are as follows (in thousands):
 
Useful
 
 
 
Accumulated
 
 
As of December 31, 2019
Life
 
Gross
 
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
Marketing contract
20
 
$
144,219

 
$
(13,220
)
 
130,999

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
Rights-of-way assets
Indefinite
 
15,597

 
 
 
15,597

Total
 
 
$
159,816

 
$
(13,220
)
 
$
146,596

 
Useful
 
 
 
Accumulated
 
 
As of December 31, 2018
Life
 
Gross
 
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
Supply contract
11.5
 
12,227

 
(12,227
)
 
$
—

Marketing contract
20
 
144,219

 
(6,009
)
 
$
138,210

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
Rights-of-way assets
Indefinite
 
15,828

 
 
 
15,828

Total
 
 
$
172,274


$
(18,236
)
 
$
154,038