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Earnings per Share - Repurchase Program (Details) - $ / shares
12 Months Ended
Jul. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share      
Dividends Payable, Date to be Paid Jul. 01, 2018    
Special stock dividend, rate percent 4.00%    
Special stock dividend, record date Jun. 15, 2018    
Repurchase Program      
Earnings Per Share      
Total number of common stock repurchased   95,709  
Average price per share of total common stock repurchased   $ 17.90  
Number of common stock repurchased     8,668
Average price per share of common stock repurchased     $ 20.63