Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance (period start)	$ 4,032	$ 4,559	$ 6,492
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(495)	773	202
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	750	(987)	307
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(641)	(313)	(2,442)
Valuation Allowances and Reserves, Balance (period end)	$ 3,646	$ 4,032	$ 4,559