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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 1,967 $ 1,890 $ 1,833
Additions charged to expense and other accounts 259 342 583
Amounts charged against reserve (528) (265) (526)
Balance at end of period 1,698 1,967 1,890
Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 710 472 429
Additions charged to expense and other accounts 2,320 2,621 1,832
Amounts charged against reserve (2,425) (2,383) (1,789)
Balance at end of period 605 710 472
Valuation Allowance of Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 4,196 3,365 3,563
Additions charged to expense and other accounts 0 831 0
Amounts charged against reserve (4,196) 0 (198)
Balance at end of period $ 0 $ 4,196 $ 3,365