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Other Assets and Accrued Liabilities - Long Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]    
Non-current portion of deferred lease revenue $ 18,420 $ 12,449
FCC spectrum license obligations 1,688 1,699
Non-current portion of financing leases 1,537 1,591
Other 658 1,037
Other liabilities $ 22,303 $ 16,776