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Shareholders' Equity (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2015
$ / shares
Sep. 15, 2015
$ / shares
Jun. 15, 2015
$ / shares
Mar. 13, 2015
$ / shares
Jun. 27, 2013
USD ($)
shares
Dec. 27, 2012
USD ($)
shares
May. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2006
USD ($)
$ / shares
shares
Mar. 31, 2004
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
director
period
$ / shares
shares
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
director
period
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Nov. 13, 2015
USD ($)
Mar. 23, 2009
$ / shares
Class of Stock [Line Items]                                            
Aggregate authorized shares | shares                   325,000,000               325,000,000        
Authorized common shares | shares                   225,000,000               225,000,000        
Authorized preference shares | shares                   100,000,000               100,000,000        
Dividends declared per common share, in dollars per share | $ / shares                                   $ 1.2 $ 1.16 $ 1.12    
Preference shares, Dividends declared and paid | $                   $ 5,595,000 $ 5,595,000 $ 5,596,000 $ 5,595,000 $ 5,595,000 $ 5,595,000 $ 5,596,000 $ 5,595,000 $ 22,381,000 $ 22,381,000 $ 24,948,000    
Preference shares, Shares issued | shares                                   7,435,000 0 0    
Preference Shares, Par Value (In dollars per share) | $ / shares                   $ 1       $ 1       $ 1 $ 1      
Preference shares, Issuance costs | $             $ 9,144,000                              
Preference shares, Shares outstanding | shares                   16,000,000       16,000,000       16,000,000 16,000,000      
Preference shares, Amount of preferred dividends in arrears, equivalent number of periods, trigger | period                   6               6        
Preference shares, Preferred stock dividends in arrears, triggered shareholder election right, number of directors | director                   2               2        
Common stock                                            
Class of Stock [Line Items]                                            
Dividends declared per common share, in dollars per share | $ / shares $ 0.3 $ 0.3 $ 0.3 $ 0.30                                    
Dividends paid, Per common share | $ / shares $ 0.3 $ 0.3 $ 0.3 $ 0.3                                    
Repurchase of shares | shares                                   2,473,000        
Share repurchase program, Authorized aggregate amount | $                                         $ 500,000,000  
Common shares repurchased during period, Aggregate value | $                                   $ (259,900,000)        
Common shares repurchased during period, Average cost per share (in dollars per share) | $ / shares                                   $ 105.10        
Remaining authorized shares per share repurchase program | $                   $ 482,300,000               $ 482,300,000        
Series C Preferred Stock                                            
Class of Stock [Line Items]                                            
Preference shares, issued | $                 $ 250,000,000                          
Preference shares, Shares issued | shares                 10,000,000                          
Preference Shares, Par Value (In dollars per share) | $ / shares                 $ 25                          
Preference shares, Shares redeemed | shares         5,000,000   5,000,000                              
Preference shares, Redemption amount | $         $ 125,000,000                                  
Preference shares, Shares outstanding | shares         5,000,000                                  
Preference shares, Redemption price per share | $ / shares                                           $ 25
Preference shares, Dividend rate                                   6.08%        
Series D Preferred Stock                                            
Class of Stock [Line Items]                                            
Preference shares, issued | $               $ 300,000,000                            
Preference shares, Shares issued | shares               12,000,000                            
Preference Shares, Par Value (In dollars per share) | $ / shares               $ 25                            
Preference shares, Shares redeemed | shares         6,000,000 6,000,000 6,000,000                              
Preference shares, Redemption amount | $         $ 150,000,000 $ 150,000,000                                
Preference shares, Shares outstanding | shares         0 6,000,000                                
Series E Preferred Stock                                            
Class of Stock [Line Items]                                            
Preference shares, issued | $             $ 275,000,000                     $ 0 $ 0 $ 265,856,000    
Preference shares, Shares issued | shares             11,000,000                              
Preference Shares, Par Value (In dollars per share) | $ / shares             $ 25                              
Preference shares, Redemption price per share | $ / shares                   $ 25               $ 25        
Preference shares, Dividend rate                                   5.375%        
Common stock                                            
Class of Stock [Line Items]                                            
Repurchase of shares | shares                                   2,473,000 5,355,000 2,451,000    
Common shares repurchased during period, Aggregate value | $                                   $ (2,473,000) $ (5,355,000) $ (2,451,000)    
Retained earnings                                            
Class of Stock [Line Items]                                            
Dividends, Common Stock | $                                   53,967,000 45,912,000 49,267,000    
Preference shares, Dividends declared and paid | $                                   22,381,000 22,381,000 24,948,000    
Common shares repurchased during period, Aggregate value | $                                   $ 0 $ (497,175,000) $ (203,703,000)