Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Wireless contract asset	$ 46,552	$ 44,844
Broadband contract acquisition and fulfillment costs	4,029	4,898
Prepaid maintenance expenses	3,252	3,329
Interest rate swaps	0	1,382
Other	7,090	6,074
Prepaid expenses and other	$ 60,923	$ 60,527