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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Goodwill, gross beginning balance $ 321,088 $ 305,163
Accumulated impairment losses, beginning balance (30,389) (27,513)
Goodwill, net beginning balance 290,699 277,650
Goodwill acquired during the year 0 15,928
Impairment losses (11,150) (2,876)
Foreign currency translation adjustment (44) (3)
Goodwill, gross ending balance 321,044 321,088
Accumulated impairment losses, ending balance (41,539) (30,389)
Goodwill, net ending balance 279,505 290,699
Office Furniture    
Goodwill [Roll Forward]    
Goodwill, gross beginning balance 137,889 121,964
Accumulated impairment losses, beginning balance (30,246) (27,370)
Goodwill, net beginning balance 107,643 94,594
Goodwill acquired during the year 0 15,928
Impairment losses (11,150) (2,876)
Foreign currency translation adjustment (44) (3)
Goodwill, gross ending balance 137,845 137,889
Accumulated impairment losses, ending balance (41,396) (30,246)
Goodwill, net ending balance 96,449 107,643
Hearth Products    
Goodwill [Roll Forward]    
Goodwill, gross beginning balance 183,199 183,199
Accumulated impairment losses, beginning balance (143) (143)
Goodwill, net beginning balance 183,056 183,056
Goodwill acquired during the year 0 0
Impairment losses 0 0
Foreign currency translation adjustment 0 0
Goodwill, gross ending balance 183,199 183,199
Accumulated impairment losses, ending balance (143) (143)
Goodwill, net ending balance $ 183,056 $ 183,056