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Long-Term Debt (Narrative 2019 Senior Notes) (Details) - USD ($)		3 Months Ended				12 Months Ended
	Dec. 02, 2019	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Dec. 17, 2013
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 0	$ 2,155,000	$ 0	$ 0	$ 2,155,000	$ 0	$ 2,901,000
2019 Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000.0
Debt instrument, stated interest rate (as percent)	5.125%
2013 Senior Notes
Debt Instrument [Line Items]
Early repayment of senior debt	$ 400,000,000.0
Loss on extinguishment of debt						$ 2,200,000
2013 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount									$ 400,000,000.0
Debt instrument, stated interest rate (as percent)		5.375%				5.375%			5.375%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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