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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, 2016
Dec. 31, 2015
Dec. 28, 2014
Balance at Beginning of Period $ 25,593 $ 44,700 $ 34,484
Increase 0   10,216
Decrease (7,484) (19,107)  
Balance at End of Period $ 18,109 $ 25,593 $ 44,700