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Long-Term Debt (Senior Notes) (Details) - Senior Notes - USD ($)
Dec. 31, 2016
Mar. 31, 2016
Feb. 19, 2016
Dec. 17, 2013
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
2016 Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 350,000,000.0  
Debt instrument, stated interest rate (percent) 6.375% 6.375% 6.375%  
Debt issuance costs capitalized     $ 5,500,000