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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Summary of income from commercial rents included in real estate revenue The following is a summary of income from commercial rents included in commercial/industrial real estate revenues as of December 31:
($ in thousands)202020192018
Base rent$6,471 $6,554 $6,444 
Percentage rent$949 $1,024 $621 
Schedule of future minimum rental income
Future minimum rental income on commercial, communication and right-of-way on non-cancelable leases as of December 31, 2020 ($ in thousands):
20212022202320242025Thereafter
$6,461 $5,637 $5,279 $5,144 $4,946 $16,664