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Other Assets and Accrued Liabilities - Long-Term Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Interest rate swaps $ 536 $ 8,323
Wireless contract asset 37,742 32,351
Contract acquisition and fulfillment costs 6,056 5,457
Other 6,135 3,760
Deferred charges and other assets $ 50,469 $ 49,891