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Real Estate Securities Schedule of Real Estate Securities (Details) (USD $)
 3 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2012
Non-Agency RMBS [Member]
Sep. 30, 2013
Non-Agency RMBS [Member]
Sep. 30, 2013
Residential Mortgage Backed Securities [Member]
Sep. 30, 2013
15-year fixed rate mortgages [Member]
Agency RMBS [Member]
Sep. 30, 2013
30-year fixed rate mortgages [Member]
Agency RMBS [Member]
Sep. 30, 2013
Adjustable Rate Residential Mortgage [Member]
Agency RMBS [Member]
Sep. 30, 2013
Interest-Only [Member]
Agency RMBS [Member]
Sep. 30, 2013
Agency Securities [Member]
Agency RMBS [Member]
Real Estate-Related Securities [Line Items]                    
Weighted Average Holdings $ 1,453,000,000                  
Current Principal     26,890,000 55,798,000 1,552,173,000 192,906,000 1,165,255,000 29,840,000 108,374,000 1,496,375,000
Unamortized Premium (Discount)     (13,400,000) (21,975,000) (64,098,000) 7,325,000 45,873,000 1,698,000 (97,019,000) (42,123,000)
Amortized Cost     13,490,000 33,823,000 1,488,075,000 200,231,000 1,211,128,000 31,538,000 11,355,000 1,454,252,000
Gross Unrealized Gain     117,000 1,305,000 11,201,000 794,000 7,443,000 169,000 1,490,000 9,896,000
Gross Unrealized Losses     (11,000) (661,000) (26,485,000) (1,575,000) (24,126,000) 0 (123,000) (25,824,000)
Fair Value $ 1,472,791,000 $ 13,596,000 $ 13,596,000 $ 34,467,000 $ 1,472,791,000 $ 199,450,000 $ 1,194,445,000 $ 31,707,000 $ 12,722,000 $ 1,438,324,000
Weighted Average Coupon     2.20% 2.88% 3.60% 3.05% 3.66% 4.47% 4.00% 3.62%
Weighted Average Yield     8.50% 7.85% 3.14% 2.25% 3.09% 2.38% 11.95% 3.03%
Weighted Average Life (Years)     7 years 292 days [1] 5 years 161 days [1] 8 years 300 days [1] 5 years 314 days [1] 9 years 362 days [1] 3 years 358 days [1] 4 years 249 days [1] 8 years 347 days [1]
[1] Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal.