Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Prepaid rent	$ 0		$ 11,245
Prepaid maintenance expenses	3,329		3,981
Interest rate swaps	1,382		4,930
Wireless contract asset	44,844		33,323
Broadband contract acquisition and fulfillment costs	4,898		4,634
Other	3,352		2,049
Prepaid expenses and other	$ 57,805	$ 48,582	$ 60,162