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Long-Term Debt (Narrative 2013 Senior Notes) (Details) - Senior Notes - 2013 Senior Notes - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Dec. 17, 2013
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 400,000,000.0
Debt instrument, stated interest rate 5.375% 5.375% 5.375%
Debt issuance costs capitalized     $ 7,200,000