Revenue Recognition (Revenue disaggregated by timing of revenue recognition) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Revenues Recognized Over Time	$ 79,815	$ 44,938
Revenues recognized at a point in time	120,718	104,848
Total revenues recognized under ASC 606	200,533	149,786
Revenues recognized under ASC 840	1,191,010	774,694
Revenues recognized under ASC 944	46,314	45,775
Revenues recognized under ASC 320	34,999	16,982
Total revenues	$ 1,472,856	$ 987,237