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Derivative Instruments and Hedging (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Interest Rate Caps [Member]
Dec. 31, 2013
Interest Rate Caps [Member]
Mar. 31, 2014
Interest Rate Cap Transfered [Member]
Nov. 30, 2013
Interest Rate Cap Transfered [Member]
Sep. 30, 2014
Credit Default Swaps [Member]
Sep. 30, 2013
Credit Default Swaps [Member]
Sep. 30, 2014
Credit Default Swaps [Member]
Sep. 30, 2013
Credit Default Swaps [Member]
Aug. 31, 2011
Credit Default Swaps [Member]
Sep. 30, 2014
Investment Derivatives [Member]
Dec. 31, 2013
Investment Derivatives [Member]
Sep. 30, 2014
Marketable Securities and Other [Member]
Credit Default Swaps [Member]
Dec. 31, 2013
Marketable Securities and Other [Member]
Credit Default Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]                                  
Strike rate, lower range         1.80%                        
Strike rate, higher range         2.59%                        
Cost of hedge         $ 661,000 $ 184,000                      
Amount of hedged item         812,400,000 579,400,000                      
Notional amount of swap transactions         736,100,000 268,900,000 69,000,000 199,900,000         100,000,000        
Upfront cost                         8,200,000        
Total exposure                         8,500,000        
Change in market value of credit default swap                         250,000        
Net credit default of swap asset (liability)                               101,000 (73,000)
Unrealized gain (loss) on derivatives (70,000) (817,000) (680,000) (7,177,000)         86,000 (689,000) (331,000) (820,000)          
Derivative assets                           769,000 560,000    
Derivative liabilities                           $ 435,000 $ 561,000