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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Oct. 31, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Subsequent Events                      
Common share quarterly cash dividend declared (in dollars per share)     $ 0.20 $ 0.20 $ 0.20 $ 0.17 $ 0.17 $ 0.17      
Amount repaid in its existing borrowings                 $ 18,000 $ 24,599  
Borrowings on revolving line of credit outstanding     $ 36,000           36,000    
Revolving credit facility                      
Subsequent Events                      
Borrowings on revolving line of credit outstanding     $ 36,000           $ 36,000   $ 0
Subsequent Events                      
Subsequent Events                      
Common share quarterly cash dividend declared (in dollars per share) $ 0.23                    
Subsequent Events | Revolving credit facility                      
Subsequent Events                      
Amount repaid in its existing borrowings   $ 10,000                  
Borrowings on revolving line of credit outstanding $ 26,000 $ 26,000