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Accounts Receivable (Components of Accounts Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 116,256 $ 106,853
Less allowances for discounts, returns and uncollectible accounts (11,868) (11,606)
Accounts receivable, net 104,388 95,247
Trade accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 115,967 105,592
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 289 $ 1,261