Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value Measurements [Abstract]
Towers and related assets	$ 19,520	$ 4,056	$ 50,761	$ 12,475
Operating lease right-of-use assets	8,156	2,896	23,611	9,151
Write-off of carrying value of decommissioned towers	1,613	1,275	4,414	3,599
Other (including tower and equipment decommission costs)	3,774	305	13,534	340
Total asset impairment and decommission costs	$ 33,063	$ 8,532	$ 92,320	$ 25,565