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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Oct. 16, 2013
Oct. 11, 2013
Oct. 30, 2008
Jul. 03, 2008
Jun. 15, 2007
Feb. 28, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2010
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       $ 1,475.0              
Non-refundable cash termination fee from the termination of the Merger Agreement       225.0              
Investment in preferred equity from the termination of the Merger Agreement       $ 1,250.0              
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   $ 649.5                  
Maximum | Affiliate of Fortress Investment Group LLC                      
Preferred equity investment                      
Ownership interest in Spin-Off entity (as a percent) 9.90%                    
Common Stock | Affiliate of Fortress Investment Group LLC                      
Changes in each class of the Company's Preferred Stock                      
Conversion of preferred stock (in shares)             8,624,000        
Series B Preferred Stock                      
Preferred equity investment                      
Issuance of preferred stock (in shares)     12,500                
Repurchase value of preferred stock                     $ 11.2
Number of shares held             0 0      
Changes in each class of the Company's Preferred Stock                      
Shares outstanding at the beginning of the period             0        
Repurchase of Preferred Stock (in shares)   2,300                 225
Shares outstanding at the end of the period             0 0      
Series B Preferred Stock | Wells Fargo Investment Holdings LLC                      
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                    
Series C Preferred Stock                      
Preferred equity investment                      
Number of shares held             8,624 8,624 8,624 8,624  
Changes in each class of the Company's Preferred Stock                      
Shares outstanding at the beginning of the period             8,624 8,624   8,624  
Repurchase of Preferred Stock (in shares)                   8,624  
Shares outstanding at the end of the period             0 8,624 8,624    
Number of shares converted             8,624        
Conversion of preferred stock (in shares)             8,624,000        
Series C Preferred Stock | Affiliate of Fortress Investment Group LLC                      
Preferred equity investment                      
Issuance of preferred stock (in shares)   14,553                  
Repurchase price of preferred stock (in dollars per share) $ 67                    
Changes in each class of the Company's Preferred Stock                      
Repurchase of Preferred Stock (in shares)   5,929                  
Series C Preferred Stock | Affiliate of Fortress Investment Group LLC                      
Preferred equity investment                      
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          
Number of shares converted             8,624