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Stock Based Compensation (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized 15.0   15.0    
Risk free interest rate       1.00%  
Expected dividend rate       3.80%  
Share-based compensation (benefit)/expense $ 2,900 $ 3,500 $ 7,838 $ 8,041  
Reversal of previously recognized equity compensation expense       2,600  
Expense associated with the accelerated issuance of shares       $ 2,700  
Compensation cost not yet recognized         $ 13,400
Weighted average remaining contractual term     2 years 2 months 12 days    
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Service period     1 year    
Expected volatility rate     22.00% 23.50%  
Risk free interest rate     1.20%    
Expected dividend rate     4.00%    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Service period     5 years    
Expected volatility rate     23.00% 26.50%  
Risk free interest rate     1.41%    
Expected dividend rate     4.60%    
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period     0.6 0.8