Revenue Recognition (Revenue disaggregated by timing of revenue recognition) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenues Recognized Over Time	$ 44,938	$ 39,079
Revenues recognized at a point in time	104,848	91,171
Total revenues recognized under ASC 606	149,786	130,250
Revenues recognized under ASC 840	774,694	865,204
Revenues recognized under ASC 944	45,775	48,046
Revenues recognized under ASC 320	16,982	35,749
Total revenues	$ 987,237	$ 1,079,249