Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	$ 292,723	$ 276,558
Less allowance for doubtful accounts	2,540	2,621
Accounts receivable, net	290,183	273,937
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	289,013	269,844
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	$ 3,710	$ 6,714