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Stock-Based Compensation (Options Outstanding) (Details) - Time-Vested Stock Options [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding (shares) 208,426 175,620 378,990
Vested or expected to vest (shares) 208,426    
Options exercisable (shares) 121,755 175,620  
Weighted-Average Remaining Contractual Term, Options Outstanding (in years) 5 years 10 months 24 days    
Weighted-Average Remaining Contractual Term, Vested or expected to vest (in years) 5 years 10 months 24 days    
Weighted-Average Remaining Contractual Term, Options exercisable (in years) 3 years 7 months 6 days    
Weighted Average Exercise Price, Options outstanding (per share) $ 21.47 $ 25.13 $ 24.32
Weighted Average Exercise Price, Vested or expected to vest (per share) 21.47    
Weighted-Average Exercise Price, Options exercisable (per share) $ 24.90 $ 25.13  
Aggregate Intrinsic Value, Options outstanding    
Aggregate Intrinsic Value, Vested or expected to vest    
Aggregate Intrinsic Value, Options exercisable