Intangible Assets (Schedule of Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Balance		$ 107,548
Acquisitions	$ 800
Balance	108,335	108,335
Wireless Licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance		107,548
Acquisitions		792
Reclassed to property and equipment		(5)
Balance	$ 108,335	$ 108,335