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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 28, 2016
Dec. 29, 2015
Balance at Beginning of Period $ 18,109 $ 25,593 $ 44,700
Increase 0    
Decrease (11,126) (7,484) (19,107)
Balance at End of Period $ 6,983 $ 18,109 $ 25,593