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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]    
Total outstanding $ 370,000 $ 370,000
Less current portion 0 0
Unamortized debt issuance costs (1,267) (1,620)
Long-term debt 368,733 368,380
Senior bank term loans    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 370,000 $ 370,000