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Long-Term Debt (Narrative 2016 Senior Notes) (Details) - Senior Notes - 2016 Senior Notes - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Feb. 19, 2016
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 350,000,000.0
Debt instrument, stated interest rate 6.375% 6.375% 6.375%
Debt issuance costs capitalized     $ 5,500,000