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Other Assets and Accrued Liabilities - Long-Term Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Interest rate swaps $ 1,252 $ 8,323
Wireless contract asset 39,819 32,351
Broadband contract acquisition and fulfillment costs 6,107 5,457
Prepaid expenses and other 6,174 3,760
Deferred charges and other assets $ 53,352 $ 49,891