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Represents the amount paid under exchange and repurchase transactions.

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Represents the number of shares of preferred stock provided with the right to exchange.

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Represents the consideration per that the shareholders would have received under the merger agreement before it was terminated.

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Represents the non-refundable cash termination fee from the termination of merger agreement.

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Represents the investment in preferred equity from the termination of merger agreement.

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Represents the total consideration from the termination of merger agreement.

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Represents the impact of exchange transaction on the outstanding preferred stock of the entity.

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No definition available.

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Represents the changes in outstanding preferred stock during the period.

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Represents the price per share of preferred stock repurchased during the period.

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Number of shares issued for each share of convertible preferred stock that is converted.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Shareholders' Equity (Details) (USD $)	0 Months Ended		12 Months Ended			0 Months Ended		12 Months Ended	1 Months Ended
Shareholders' Equity (Details) (USD $)	Jul. 03, 2008	Jun. 15, 2007	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 11, 2013	Oct. 30, 2008	Dec. 31, 2010	Feb. 28, 2013
Preferred equity investment
Consideration that the shareholders would have received under merger agreement before termination (in dollars per share)		$ 67.00
Total consideration from the termination of the Merger Agreement	$ 1,475,000,000
Non-refundable cash termination fee from the termination of the Merger Agreement	225,000,000
Investment in preferred equity from the termination of the Merger Agreement	1,250,000,000
Repurchase value of preferred stock				649,518,000
Changes in each class of the Company's Preferred Stock
Changes in the Company's outstanding Preferred Stock			0		0
Affiliates of Fortress Centerbridge and W F Investment Holdings
Preferred equity investment
Exchange agreement amount paid						649,500,000
Maximum \| Affiliate of Fortress Investment Group LLC
Preferred equity investment
Ownership interest in Spin-Off entity (as a percent)			9.90%
Series B Preferred Stock
Preferred equity investment
Issuance of preferred stock (in shares)							12,500
Repurchase of Preferred Stock (in shares)				6,498				225
Repurchase value of preferred stock								$ 11,200,000
Changes in each class of the Company's Preferred Stock
Shares outstanding at the beginning of the period				12,275
Repurchase of Preferred Stock (in shares)				(6,498)				(225)
Impact of exchange transaction				(5,777)
Series B Preferred Stock \| Centerbridge Partners LP
Preferred equity investment
Number of shares authorized to be repurchased						2,300
Series B Preferred Stock \| Wells Fargo Investment Holdings LLC
Preferred equity investment
Repurchase of Preferred Stock (in shares)									225
Changes in each class of the Company's Preferred Stock
Repurchase of Preferred Stock (in shares)									(225)
Series B Preferred Stock \| Affiliate of Fortress Investment Group LLC
Preferred equity investment
Number of shares of preferred stock provided with the right to exchange as per the Exchange Agreement			9,750
Ceiling price at which the shares of preferred stock are redeemable at maturity (in dollars per share)			67
Number of shares held			0
Changes in each class of the Company's Preferred Stock
Shares outstanding at the end of the period			0
Series C Preferred Stock
Preferred equity investment
Number of shares held			8,624	8,624
Number of shares of common stock issued to each share of Series C preferred stock on conversion			1,000
Changes in each class of the Company's Preferred Stock
Impact of exchange transaction				8,624
Shares outstanding at the end of the period			8,624	8,624
Series C Preferred Stock \| Affiliate of Fortress Investment Group LLC
Preferred equity investment
Repurchase price of preferred stock (in dollars per share)			67
Number of shares held			8,624
Changes in each class of the Company's Preferred Stock
Shares outstanding at the end of the period			8,624