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Long-Term Debt (Narrative 2012 Senior Notes) (Details) - 2012 Senior Notes - USD ($)
Mar. 31, 2016
Mar. 31, 2015
Jan. 31, 2013
Jan. 31, 2012
Debt Instrument [Line Items]        
Debt issuance costs capitalized       $ 12,600,000
Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 250,000,000.0
Debt instrument, stated interest rate   8.125% 8.125%  
Long-term debt $ 0