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Shareholders' Equity - Share Issuances and Purchases (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 19, 2017
$ / shares
shares
Sep. 14, 2017
$ / shares
shares
Jun. 30, 2017
employee
$ / shares
shares
Jun. 15, 2017
trustee
$ / shares
shares
Feb. 10, 2017
USD ($)
$ / shares
shares
Sep. 30, 2017
shares
Sep. 30, 2016
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Share-based Compensation Arragement by Chare-based Payment Award [Line Items]                      
Reduction to net income available to common share holders | $               $ 0 $ 0 $ 9,893 $ 0
Series D preferred shareholders'                      
Share-based Compensation Arragement by Chare-based Payment Award [Line Items]                      
Shares redeemed (in shares) | shares         11,600,000            
Preferred stock, dividend rate, percentage         7.125%         7.125%  
Preferred stock, liquidation preference (in dollars per share) | $ / shares         $ 25            
Dividends payable at redemption | $         $ 291,435            
Reduction to net income available to common share holders | $                   $ 9,893  
Five trustees | Common Stock                      
Share-based Compensation Arragement by Chare-based Payment Award [Line Items]                      
Share granted in period (in shares) | shares       3,000              
Value of grants in period (in dollars per share) | $ / shares       $ 30.12              
Number of trustees | trustee       5              
Former employees | Common Stock                      
Share-based Compensation Arragement by Chare-based Payment Award [Line Items]                      
Shares repurchased (in shares) | shares     499                
Share price of shares repurchased (in dollars per share) | $ / shares     $ 29.15                
Number of employees who sold stock repurchased | employee     2                
Officers and other employees | Common Stock                      
Share-based Compensation Arragement by Chare-based Payment Award [Line Items]                      
Share granted in period (in shares) | shares   85,000                  
Value of grants in period (in dollars per share) | $ / shares   $ 28.08                  
Shares repurchased (in shares) | shares 18,559         18,559 19,677        
Share price of shares repurchased (in dollars per share) | $ / shares $ 27.98