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Subsequent Event (Details) - USD ($)
Mar. 31, 2016
Feb. 29, 2016
2011 Notes [Member]    
Subsequent Event [Line Items]    
Debt origination costs, net   $ 3,400,000
2011 Fixed Rate Notes [Member]    
Subsequent Event [Line Items]    
Long-term debt   267,600,000
2011 Variable Rate Notes [Member]    
Subsequent Event [Line Items]    
Long-term debt   $ 72,000,000
2016 Fixed Rate Notes [Member] | Scenario, Forecast [Member]    
Subsequent Event [Line Items]    
Debt instrument, face amount $ 425,000,000  
2016 Variable Rate Notes [Member] | Scenario, Forecast [Member]    
Subsequent Event [Line Items]    
Debt instrument, face amount $ 150,000,000