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Stock Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense and directors' fees related to stock awards $ 8.0 $ 8.9 $ 5.3
Compensation expense, non-vested awards $ 6.5 $ 7.0 $ 3.8
Number of shares issued to employees, directors and officers 185,169    
Nonvested awards, total compensation cost not yet recognized $ 3.8    
Weighted Average [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested awards, total compensation cost not yet recognized, period for recognition 1 year    
Stock Awards [Member] | Independent directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year