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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 01, 2019
Jul. 31, 2019
Jun. 29, 2019
Mar. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Subsequent Events                  
Common share quarterly cash dividend declared (in dollars per share)     $ 0.20 $ 0.20 $ 0.17 $ 0.17      
Amount repaid in its existing borrowings             $ 9,000 $ 8,802  
Borrowings on revolving line of credit outstanding     $ 41,000       41,000    
Revolving credit facility                  
Subsequent Events                  
Borrowings on revolving line of credit outstanding     $ 41,000       $ 41,000   $ 0
Subsequent Events                  
Subsequent Events                  
Common share quarterly cash dividend declared (in dollars per share) $ 0.20                
Subsequent Events | Revolving credit facility                  
Subsequent Events                  
Amount repaid in its existing borrowings   $ 9,000              
Borrowings on revolving line of credit outstanding   $ 32,000