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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Repurchase Agreements Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Debt Disclosure [Abstract]    
Repurchase agreement, average borrowings $ 102.8  
Repurchase agreement, maximum amount borrowed $ 274.5 $ 0.0
Repurchase agreement, weighted average interest rate 0.64%