Repurchase Agreements (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Alpine Securitization Corporation/Credit Suisse
Repurchase agreements counterparty risk
Amount at Risk	$ 727,812	[1],[2]
Weighted Average Months to Maturity for Repurchase Agreements	2 months	[2]
Counterparty risk as percent of Stockholders' Equity, minimum	23.70%	[2]
Alpine Securitization Corporation
Repurchase agreements counterparty risk
Amount at Risk	710,200
Credit Suisse Securities USA LLC
Repurchase agreements counterparty risk
Amount at Risk	17,600
Wells Fargo
Repurchase agreements counterparty risk
Amount at Risk	365,222	[1],[3]
Weighted Average Months to Maturity for Repurchase Agreements	8 months	[3]
Counterparty risk as percent of Stockholders' Equity, minimum	11.90%	[3]
Wells Fargo Bank
Repurchase agreements counterparty risk
Amount at Risk	246,700
Wells Fargo Securities LLC
Repurchase agreements counterparty risk
Amount at Risk	118,500
RBS
Repurchase agreements counterparty risk
Amount at Risk	246,671	[1]
Weighted Average Months to Maturity for Repurchase Agreements	2 months
Counterparty risk as percent of Stockholders' Equity, minimum	8.00%
UBS
Repurchase agreements counterparty risk
Amount at Risk	244,076	[1],[4],[5]
Weighted Average Months to Maturity for Repurchase Agreements	21 months	[4],[5]
Counterparty risk as percent of Stockholders' Equity, minimum	7.90%	[4],[5]
UBS AG
Repurchase agreements counterparty risk
Amount at Risk	242,700
UBS Securities LLC
Repurchase agreements counterparty risk
Amount at Risk	$ 1,300

[1] The amount at risk reflects the difference between (a) the amount loaned to the Company through repurchase agreements and repurchase agreements underlying Linked Transactions, including interest payable, and (b) the cash and the fair value of the securities pledged by the Company as collateral and MBS underlying Linked Transaction, including accrued interest receivable on such securities.

[2] Includes $710.2 million at risk with Alpine Securitization Corporation and $17.6 million at risk with Credit Suisse Securities (USA) LLC. Alpine Securitization Corporation is a special purpose funding vehicle that is a consolidated affiliate of Credit Suisse Group. Counterparty rating shown is the asset backed short term rating for Alpine Securitization Corporation.

[3] Includes $246.7 million at risk with Wells Fargo Bank, NA and $118.5 million at risk with Wells Fargo Securities LLC.

[4] Includes Non-Agency MBS pledged as collateral with contemporaneous repurchase and reverse repurchase agreements.

[5] Includes $242.7 million at risk with UBS AG and $1.3 million at risk with UBS Securities LLC.