Business Segments (Revenue by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 229,394	$ 232,154
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	199,346	200,629
Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 30,048	$ 31,525