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Stockholders' Equity (Weighted Average Assumptions) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.61% 1.44%  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield     1.18%
Expected volatility     27.08%
Risk-free interest rate     2.65%
Expected holding period (years)     5 years
Black-Scholes value (in dollars per share) $ 6.38   $ 6.38