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Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2013
Derivative [Line Items]      
Net realized gains losses on periodic settements of interest rate swaps   $ 49 $ (20)
Net realized gains losses other than on periodic settements of interest rate swaps   4,224 12,670
Net realized gains on financial derivatives 0 4,273 12,650
Unrealized gain loss on accrued periodic settlements on interest rate swaps   (3,109) (4,151)
Unrealized gain loss on other than accured periodic settlements on interest rate swaps   (9,063) 20,265
Change in net unrealized gains (losses) on financial derivatives 0 (12,172) 16,114
Interest Rate Swap [Member]
      
Derivative [Line Items]      
Net realized gains losses on periodic settements of interest rate swaps   49 (20)
Net realized gains losses other than on periodic settements of interest rate swaps   2,451 2,631
Net realized gains on financial derivatives   2,500 2,611
Unrealized gain loss on accrued periodic settlements on interest rate swaps   (3,109) (4,151)
Unrealized gain loss on other than accured periodic settlements on interest rate swaps   (1,420) 25,819
Change in net unrealized gains (losses) on financial derivatives   (4,529) 21,668
Interest Rate Swaption [Member]
      
Derivative [Line Items]      
Net realized gains losses other than on periodic settements of interest rate swaps   0 0
Net realized gains on financial derivatives   0 0
Unrealized gain loss on other than accured periodic settlements on interest rate swaps   (86) (86)
Change in net unrealized gains (losses) on financial derivatives   (86) (86)
TBA securities [Member]
      
Derivative [Line Items]      
Net realized gains losses other than on periodic settements of interest rate swaps   1,773 10,039
Net realized gains on financial derivatives   1,773 10,039
Unrealized gain loss on other than accured periodic settlements on interest rate swaps   (7,557) (5,468)
Change in net unrealized gains (losses) on financial derivatives   $ (7,557) $ (5,468)