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Stock Based Compensation - Restricted stock (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 02, 2018
Mar. 15, 2018
Jul. 03, 2017
May 17, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Units              
Unvested restricted stock units outstanding         2,778    
Weighted Average Grant Date Fair Value              
Fair values of vested restricted stock and stock options         $ 0.1 $ 0.1 $ 0.1
Directors              
Number of Units              
Number of restricted stock awards granted 2,778   5,334 8,919 2,778 5,334 8,919
Number of units, vested         5,334 2,229 6,690
Weighted Average Grant Date Fair Value              
Weighted average grant date fair value, granted (in dollars per share)         $ 18.00 $ 18.75 $ 16.82
Officers              
Number of Units              
Number of restricted stock awards granted         9,956    
Number of units, vested         9,956    
Issuance of common stock for officer compensation, net of tax withholding (in shares)   9,956          
Weighted Average Grant Date Fair Value              
Weighted average grant date fair value, granted (in dollars per share)         $ 19.32    
Fair values of vested restricted stock and stock options         $ 0.2