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Other Assets and Accrued Liabilities - Long Term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]    
Noncurrent portion of deferred lease revenue $ 18,687 $ 12,449
FCC spectrum license obligations 3,845 1,699
Noncurrent portion of financing leases 1,492 1,591
Other 881 1,252
Other liabilities $ 24,905 $ 16,991