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Secured and Unsecured Debt (Details 1) - Line of Credit Facility, Lender [Domain] - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2013
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Unamortized discount $ 5,700   $ 6,700
Secured credit facilities      
Borrowings outstanding 2,300   1,900
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member]      
Line of Credit Facility [Line Items]      
Unamortized discount 0   6
Fannie Mae [Member]      
Secured credit facilities      
Borrowings outstanding 815,666   $ 834,282
Weighted average daily borrowings during the period ended 830,434 $ 835,873  
Maximum daily borrowings during the period ended $ 834,003 $ 837,564  
Weighted average interest rate during the period ended 4.01% 4.10%  
Interest rate at the end of the period 4.05%   4.00%
Four Point Two Five Percentage Medium-Term Notes due June 2018 [Member]      
Line of Credit Facility [Line Items]      
Unamortized discount $ 1,251   $ 1,465
Three point seven percent medium term note due October 2020 [Member]      
Line of Credit Facility [Line Items]      
Unamortized discount 42   46
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]      
Line of Credit Facility [Line Items]      
Unamortized discount 2,344   2,523
3.75 MTN Due July 2024 [Member]      
Line of Credit Facility [Line Items]      
Unamortized discount $ 938   $ 990