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Real Estate Securities Schedule of Real Estate Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Real Estate-Related Securities [Line Items]    
Fair Value $ 13,596 $ 1,326,036
Non-Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal 26,890 50,006
Unamortized Premium (Discount) (13,400) (21,327)
Amortized Cost 13,490 28,679
Gross Unrealized Gain 117 2,196
Gross Unrealized Losses (11) (194)
Fair Value 13,596 30,681
Weighted Average Coupon 2.20% 2.84%
Weighted Average Yield 8.50% 9.12%
Weighted Average Life (Years) 7 years 292 days [1] 5 years 197 days [1]
Residential Mortgage Backed Securities [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal   1,310,647
Unamortized Premium (Discount)   30,711
Amortized Cost   1,352,076
Gross Unrealized Gain   5,654
Gross Unrealized Losses   (31,694)
Fair Value   1,326,036
Weighted Average Coupon   3.72%
Weighted Average Yield   3.38%
Weighted Average Life (Years)   8 years 204 days [1]
15-year fixed rate mortgages [Member] | Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal   179,906
Unamortized Premium (Discount)   7,153
Amortized Cost   187,059
Gross Unrealized Gain   65
Gross Unrealized Losses   (3,252)
Fair Value   183,872
Weighted Average Coupon   3.09%
Weighted Average Yield   2.52%
Weighted Average Life (Years)   5 years 277 days [1]
30-year fixed rate mortgages [Member] | Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal   1,029,629
Unamortized Premium (Discount)   41,565
Amortized Cost   1,071,194
Gross Unrealized Gain   490
Gross Unrealized Losses   (28,111)
Fair Value   1,043,573
Weighted Average Coupon   3.79%
Weighted Average Yield   3.30%
Weighted Average Life (Years)   9 years 292 days [1]
Adjustable Rate Residential Mortgage [Member] | Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal   43,525
Unamortized Premium (Discount)   2,647
Amortized Cost   46,172
Gross Unrealized Gain   46
Gross Unrealized Losses   (103)
Fair Value   46,115
Weighted Average Coupon   4.72%
Weighted Average Yield   3.24%
Weighted Average Life (Years)   3 years 288 days [1]
Reverse mortgages [Member] | Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal   7,581
Unamortized Premium (Discount)   673
Amortized Cost   8,254
Gross Unrealized Gain   16
Gross Unrealized Losses   (2)
Fair Value   8,268
Weighted Average Coupon   4.85%
Weighted Average Yield   2.90%
Weighted Average Life (Years)   3 years 150 days [1]
Interest-Only [Member] | Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Amortized Cost   10,718
Gross Unrealized Gain   2,841
Gross Unrealized Losses   (32)
Fair Value   13,527
Weighted Average Coupon   3.97%
Weighted Average Yield   11.79%
Weighted Average Life (Years)   5 years 7 days [1]
Agency Securities [Member] | Agency RMBS [Member]
   
Real Estate-Related Securities [Line Items]    
Current Principal   1,260,641
Unamortized Premium (Discount)   52,038
Amortized Cost   1,323,397
Gross Unrealized Gain   3,458
Gross Unrealized Losses   (31,500)
Fair Value   $ 1,295,355
Weighted Average Coupon   3.75%
Weighted Average Yield   3.26%
Weighted Average Life (Years)   8 years 245 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.