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Leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Schedule of Lease Costs The following table presents lease costs disaggregated by type:
For the Three Months Ended September 30,For the Nine Months Ended September 30,
(Dollars in thousands)2021202020212020
Operating lease cost$1,651 $1,423 $4,612 $4,197 
Short-term lease cost 2,563 2,108 7,946 6,122 
Short-term lease cost - related party(1)
— 892 — 2,681 
Total lease cost$4,214 $4,423 $12,558 $13,000 
(1) A former member of our Board of Directors, who departed the Board during the third quarter of 2020, concurrently served as a director for an entity that leases transmission tower sites to the Company.

The following table presents supplemental cash flow information:
For the Nine Months Ended September 30,
(Dollars in thousands)20212020
Cash paid for amounts included in the measurement of lease liabilities - operating leases$4,125$4,127

The following table presents the weighted average remaining lease term and discount rate:
(Dollars in thousands)September 30, 2021
Weighted-average remaining lease term - operating leases (in years)4.82
Weighted-average discount rate - operating leases4.53%
Schedule of Maturities of Lease Liabilities
Maturities of lease liabilities as of September 30, 2021, were as follows:
For the Year Ended December 31,(Dollars in thousands)
2021 (remaining three months)
$1,637 
20225,138 
20233,954 
20243,007 
20252,197 
Thereafter3,685 
Total future lease payments19,618 
Imputed interest(2,024)
Total$17,594