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Shareholders' Equity - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 18, 2016
Nov. 30, 2016
May 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 01, 2016
Authorized Shares [Abstract]              
Authorized Share Capital Value       $ 200,000,000 $ 200,000,000    
Common Shares [Abstract]              
Merger price per share $ 137.50            
Special dividend per share $ 3.00            
Percentage ownership 100.00%            
Common shares, shares issued 1     100,000,000 87,237,220    
Common shares, par value $ 1.00     $ 0.00000001 $ 1    
Total share capital       $ 1.00      
Preferred Shares [Abstract]              
Preferred shares, par value       $ 1 $ 1    
Loss on redemption of preferred shares       $ 4,908,000 $ 0 $ 0  
Redemption price             $ 25
Preferred stock cash payment per share $ 1.25            
Preferred stock cash payment $ 43,000,000            
Restriction on common dividends 67.00%     67.00%      
Preferred stock exchanged     0        
Dividends upon redemption   $ 2,000,000          
Series D 6.5% cumulative              
Preferred Shares [Abstract]              
Preferred stock exchanged     (6,415,264)        
Series E 7.25% cumulative              
Preferred Shares [Abstract]              
Preferred stock exchanged     (11,753,798)        
Series F 5.875% non-cumulative              
Preferred Shares [Abstract]              
Preferred stock exchanged     (7,320,574)