Derivative Instruments Schedule of Swaptions (Details) - USD ($) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2014 |
Dec. 31, 2015 |
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| Derivative [Line Items] | |||||
| Financial derivatives–assets, at fair value | [1] | $ 3,072 | $ 2,183 | ||
| Financial derivatives–liabilities, at fair value | [1] | (8,700) | $ (4,725) | ||
| Straddle [Member] | Interest Rate Swaption [Member] | |||||
| Derivative [Line Items] | |||||
| Financial derivatives–assets, at fair value | $ 78 | ||||
| Fixed Pay Rate on Derivatives | 3.00% | ||||
| Maturity term of asset underlying derivative contract | 10 years | ||||
| Derivative notional | $ 9,700 | ||||
| Derivative, Remaining Maturity | 6 months 15 days | ||||
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