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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Jan. 15, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation $ 1,282 $ 1,385 $ 2,808 $ 2,970  
Unrecognized Stock-Based Compensation Expense, Non-vested Shares 7,600   $ 7,600    
Weighted Average Remaining Vesting Period, Non-Vested Shares     1 year 10 months 12 days    
Expected Stock-Based Compensation, Remainder of Fiscal Year $ 2,800   $ 2,800    
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