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Offsetting of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Offsetting Assets and Liabilities [Line Items] |  |  |
Financial derivatives-assets at fair value | $ 23,181 | [1] | $ 0
Derivative, Fair Value, Net | 16,114 |  |
Financial derivatives-liabilities at fair value | (7,067) | [1] | 0
Repurchase agreements | (1,292,946) | [1] | 0
Repurchase agreements, net | (1,292,946) | [1] |
Repurchase Agreements, collateral amount | 1,296,756 | [2],[3] |
Cash Collateral Received Pledged for Repurchase Agreements | (3,810) | [2] |
Repurchse agreements and related collateral, net | 0 |  |
Derivative Financial Instruments, Liabilities [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Derivative, Fair Value, Net | 0 | [1] |
Securities collateral on derivatives | 0 | [2],[3] |
Cash collateral received or pledged for derivatives | 0 | [2] |
Derivatives and related collateral, net | 0 |  |
Derivative Financial Instruments, Assets [Member] |  |  |
Offsetting Assets and Liabilities [Line Items] |  |  |
Derivative, Fair Value, Net | 16,114 | [1] |
Securities collateral on derivatives | 0 | [2],[3] |
Cash collateral received or pledged for derivatives | (3,311) | [2] |
Derivatives and related collateral, net | $ 12,803 |  |
[1] | On the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.
[2] | As collateral is called or posted per counterparty it is generally called or posted across all positions with each respective counterparty.
[3] | Amounts disclosed in the Financial Instruments column of the table represent collateral that is available to be offset against balances associated with repurchase agreements.

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