Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Measurements [Abstract]
Asset impairment	$ 139,466	$ 34,734	$ 24,813
Right-of-use asset impairment	45,100
Write-off of carrying value of decommissioned towers	12,015	8,095	6,349
Other (including tower and equipment decommission costs)	17,906	331	1,882
Total asset impairment and decommission costs	$ 169,387	$ 43,160	$ 33,044