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Stock Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related to stock awards $ 2.0 $ 2.6 $ 7.7 $ 6.8
Amortization of unvested shares     $ 6.2 $ 5.0
Total shares issued to employees, directors, and officers     183,609  
Unrecognized compensation cost related to nonvested $ 5.0   $ 5.0  
Stock Awards [Member] | Independent Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year  
Weighted Average [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to nonvested, weighted-average vesting period (in years)     1 year