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Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
Our identifiable intangible assets are as follows (in thousands):
UsefulAccumulated
As of December 31, 2020LifeGrossAmortizationNet
Intangible assets subject to amortization:
Marketing contract 20144,219 (20,431)123,788 
Intangible assets not subject to amortization:
Rights-of-way assets Indefinite36,316 36,316 
Total$180,535 $(20,431)$160,104 
UsefulAccumulated
As of December 31, 2019LifeGrossAmortizationNet
Intangible assets subject to amortization:
Marketing contract 20144,219 (13,220)$130,999 
Intangible assets not subject to amortization:
Rights-of-way assets Indefinite15,597 15,597 
Total$159,816 $(13,220)$146,596