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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative Assets:    
Derivative assets, net $ 10,833 $ 3,435
Fair Value Measurements Recurring [Member]    
Derivative Assets:    
Counterparty and Cash Collateral Netting (3,882) (4,059)
Assets, fair value disclosure, Total 10,833 3,435
Fair Value Measurements Recurring [Member] | Interest Rate Floor [Member]    
Derivative Assets:    
Derivative assets, net 9,447 1,747
Counterparty and Cash Collateral Netting 0 0
Fair Value Measurements Recurring [Member] | Interest Rate Cap [Member]    
Derivative Assets:    
Derivative assets, net 97 361
Counterparty and Cash Collateral Netting 0 0
Fair Value Measurements Recurring [Member] | Credit Default Swaps [Member]    
Derivative Assets:    
Derivative assets, net 784 1,093
Counterparty and Cash Collateral Netting (3,882) (4,059)
Fair Value Measurements Recurring [Member] | Options on Futures Contracts [Member]    
Derivative Assets:    
Derivative assets, net 505 234
Counterparty and Cash Collateral Netting 0 0
Fair Value Measurements Recurring [Member] | Quoted Market Prices (Level 1)    
Derivative Assets:    
Assets, fair value disclosure, Total 505 234
Fair Value Measurements Recurring [Member] | Quoted Market Prices (Level 1) | Interest Rate Floor [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Quoted Market Prices (Level 1) | Interest Rate Cap [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Quoted Market Prices (Level 1) | Credit Default Swaps [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Quoted Market Prices (Level 1) | Options on Futures Contracts [Member]    
Derivative Assets:    
Derivative assets, net 505 234
Fair Value Measurements Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Derivative Assets:    
Assets, fair value disclosure, Total 14,210 7,260
Fair Value Measurements Recurring [Member] | Significant Other Observable Inputs (Level 2) | Interest Rate Floor [Member]    
Derivative Assets:    
Derivative assets, net 9,447 1,747
Fair Value Measurements Recurring [Member] | Significant Other Observable Inputs (Level 2) | Interest Rate Cap [Member]    
Derivative Assets:    
Derivative assets, net 97 361
Fair Value Measurements Recurring [Member] | Significant Other Observable Inputs (Level 2) | Credit Default Swaps [Member]    
Derivative Assets:    
Derivative assets, net 4,666 5,152
Fair Value Measurements Recurring [Member] | Significant Other Observable Inputs (Level 2) | Options on Futures Contracts [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Significant Unobservable Inputs (Level 3)    
Derivative Assets:    
Assets, fair value disclosure, Total 0 0
Fair Value Measurements Recurring [Member] | Significant Unobservable Inputs (Level 3) | Interest Rate Floor [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Significant Unobservable Inputs (Level 3) | Interest Rate Cap [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Significant Unobservable Inputs (Level 3) | Credit Default Swaps [Member]    
Derivative Assets:    
Derivative assets, net 0 0
Fair Value Measurements Recurring [Member] | Significant Unobservable Inputs (Level 3) | Options on Futures Contracts [Member]    
Derivative Assets:    
Derivative assets, net $ 0 $ 0