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Other Assets and Accrued Liabilities - Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]      
Sales and property taxes payable $ 4,409   $ 4,281
Asset retirement obligations 407   582
Accrued programming costs 3,125   2,886
Financing leases 89   0
FCC spectrum licenses 87   0
Other current liabilities 6,614   6,814
Accrued liabilities and other $ 14,731 $ 14,151 $ 14,563