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Employee Benefit Plans - Additional Information (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jul. 02, 2018
Jan. 05, 2018
Jul. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Grants     20,000 0  
Compensation expense       $ 304,000 $ 310,000
Expected compensation expense in 2020 and 2021       304,000  
Expected compensation expense in 2022       238,000  
Expected compensation expense in 2023       5,000  
Aggregate intrinsic value of options exercisable       $ 40,000 9,000
Expected to be recognized over weighted average period       2 years 9 months 18 days  
Grant date fair value of all options granted         $ 55,000
Stock - based compensation plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Number of shares authorized for options       194,168  
Stock options exercise price $ 17.75 $ 17.52      
Term of option       10 years  
Share based payment award, vesting period       5 years