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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Deferred tax assets:    
Accrued compensation and related expense $ 16,359 $ 25,148
Allowance for doubtful accounts 2,160 2,159
Net operating loss carryforwards 3,278 4,097
Accrued expenses and other 2,482 2,462
Total gross deferred tax assets 24,279 33,866
Less: valuation allowance (2,689) (4,003)
Total deferred tax assets net of valuation allowance 21,590 29,863
Deferred tax liabilities:    
Goodwill and other intangible asset amortization 5,670 4,715
GNU capital gain upon distribution 245  
Property and equipment 4,495 3,723
Tax basis in excess of financial basis of convertible debentures 1,254 2,569
Total deferred tax liabilities 11,664 11,007
Net deferred tax assets 9,926 $ 18,856
Net change in valuation allowance $ (1,300)