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Notes Payable and Amounts Due Under Repurchase Agreements (2021 Notes Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Jul. 17, 2013
2011 Line of Credit [Member]      
Debt Instrument [Line Items]      
Repayments of line of credit $ 15.0    
July 2021 Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 400.0
Interest rate   6.625%  
Deferred financing costs   $ 9.0