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Receivables (Schedule of Sales-Type Leases) (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Minimum lease payments receivable $ 20,425 $ 59,171
Less: Unearned income 1,447 2,253
Total lease receivables 18,978 56,918
Less: Long-term receivables included in other assets 6,297 27,790
Current portion of lease receivables $ 12,681 $ 29,128