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Other Assets and Accrued Liabilities - Long Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]    
Noncurrent portion of deferred lease revenue $ 19,066 $ 18,687
FCC spectrum license obligations 3,817 3,845
Noncurrent portion of financing leases 1,575 1,492
Other 572 881
Other liabilities $ 25,030 $ 24,905