Investments In Unconsolidated Affiliates	12 Months Ended
Investments In Unconsolidated Affiliates	Dec. 31, 2011
Investments In Unconsolidated Affiliates [Abstract]
Investments In Unconsolidated Affiliates	NOTE 5 — INVESTMENTS IN UNCONSOLIDATED AFFILIATES To facilitate the issuance of Unsecured borrowings, Capstead formed and capitalized three Delaware statutory trusts through the issuance to the Company of the trusts' common securities totaling $3.1 million (see NOTE 7). The Company's equity in the earnings of the trusts consists solely of the common trust securities' pro rata share in interest accruing on Unsecured borrowings issued to the trusts.

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

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