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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Jan. 15, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 1,526 $ 1,585  
Unrecognized Stock-Based Compensation Expense, Non-vested Shares $ 9,000    
Weighted Average Remaining Vesting Period, Non-Vested Shares 2 years 1 month 12 days    
Expected Stock-Based Compensation, Remainder of Fiscal Year $ 4,200    
Certain Employees and Officers [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     417,500
Outside Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     47,470