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Long-Term Debt (2013 Senior Notes) (Details) - USD ($)
Jun. 30, 2015
Mar. 31, 2015
Dec. 17, 2013
Jan. 31, 2012
Debt Instrument [Line Items]        
Percentage of subsidiary owned     100.00% 100.00%
Senior Notes | 2013 Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 400,000,000.0  
Debt instrument, stated interest rate (percent) 5.375% 5.375% 5.375%  
Debt issuance costs capitalized     $ 7,200,000