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Stock-Based Compensation Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement [Line Items]    
Compensation expense $ 1,560 $ 1,510
Stock-based compensation expense, net of tax benefit $ 1,229 $ 1,049
Directors' Plan [Member]    
Statement [Line Items]    
Shares reserved for future grants under the stock option and compensation plan 312  
Employee Equity Plan [Member]    
Statement [Line Items]    
Awards vesting period (in years) 3 years  
Shares reserved for future grants under the stock option and compensation plan 10,600