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Long-Term Debt (Narrative 2016 Senior Notes) (Details) - Senior Notes - 2016 Senior Notes - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 21, 2018
Feb. 19, 2016
Debt Instrument [Line Items]      
Debt instrument, face amount   $ 250,000,000 $ 350,000,000
Debt instrument, stated interest rate (as percent)   6.375% 6.375%
Write off of deferred debt issuance cost $ 2,700,000    
Unamortized premium $ 9,600,000