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Shareholders' Equity (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jul. 03, 2008
Jun. 15, 2007
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 11, 2013
Affiliates of Fortress, Centerbridge, and WF Investment Holdings, LLC
Dec. 31, 2013
Maximum
Affiliate of Fortress Investment Group LLC
Dec. 31, 2011
Common Stock
Oct. 30, 2008
Series B Preferred Stock
Dec. 31, 2013
Series B Preferred Stock
Dec. 31, 2010
Series B Preferred Stock
Dec. 31, 2011
Series B Preferred Stock
Oct. 11, 2013
Series B Preferred Stock
Centerbridge
Feb. 28, 2013
Series B Preferred Stock
Wells Fargo Investment Holdings, LLC
Dec. 31, 2013
Series B Preferred Stock
Affiliate of Fortress Investment Group LLC
Dec. 31, 2013
Series C Preferred Stock
Oct. 11, 2013
Series C Preferred Stock
Affiliate of Fortress Investment Group LLC
Dec. 31, 2013
Series C Preferred Stock
Affiliate of Fortress Investment Group LLC
Stockholders' Equity                                    
Number of shares of common stock repurchased               2,981,406                    
Amount for which shares of stock are repurchased         $ 105,206,000     $ 105,200,000                    
Average price paid per share of common stock repurchased (in dollars per share)               $ 35.29                    
Adjustment for the impact of the spin-off transaction in average price of common stock repurchased (in dollars per share)               $ 7.97                    
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                                  
Issuance of preferred stock (in shares)                 12,500                  
Repurchase of Preferred Stock (in shares)                   6,498 225     225        
Repurchase value of preferred stock     649,518,000               11,200,000              
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      
Repurchase price of preferred stock (in dollars per share)                                   $ 67
Ownership interest in Spin-Off entity (as a percent)             9.90%                      
Number of shares authorized to be repurchased                         2,300          
Number of shares held                       12,275     0 8,624   8,624
Exchange agreement amount paid           $ 649,500,000                        
Exchange agreement number of preferred shares issued                                 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                                    
Shares outstanding at the beginning of the period                   12,275   12,275            
Repurchase of Series B Preferred Stock                   (6,498) (225)     (225)        
Impact of exchange transaction                   (5,777)           8,624    
Shares outstanding at the end of the period                       12,275     0 8,624   8,624
Changes in the Company's outstanding Preferred Stock       0 0