Concentration of Credit Risk (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Interest Rate Swap [Member] | Counterparties
Concentration Risk [Line Items]
Derivative, Notional Amount	$ 78,988
Interest rate swap	(3,217)
Bank of America, N.A. [Member] | Total derivative assets
Concentration Risk [Line Items]
Credit Risk Derivative Assets, at Fair Value	105
Bank of America, N.A. [Member] | Total derivative assets | Counterparties
Concentration Risk [Line Items]
Derivative Asset, Notional Amount	2,356
MORGAN STANLEY AND CO. LLC [Member] | Total derivative assets
Concentration Risk [Line Items]
Credit Risk Derivative Assets, at Fair Value	11,720
MORGAN STANLEY AND CO. LLC [Member] | Total derivative assets | Counterparties
Concentration Risk [Line Items]
Derivative Asset, Notional Amount	595,785
MORGAN STANLEY AND CO. LLC [Member] | Credit Default Swap, Selling Protection [Member] | Counterparties
Concentration Risk [Line Items]
Derivative Asset, Notional Amount	297,612
MORGAN STANLEY AND CO. LLC [Member] | Credit Default Swap, Buying Protection [Member] | Counterparties
Concentration Risk [Line Items]
Derivative Asset, Notional Amount	$ 298,173