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Fair Value of Financial Instruments (Details 5) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 03, 2015
Oct. 03, 2015
Jan. 03, 2015
Credit Facilities      
Fair value liabilities reconciliation of changes      
Fair value of debt $ 80,000 $ 80,000 $ 87,400
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Contingent consideration      
Fair value liabilities reconciliation of changes      
Balance at the beginning of the period 15,092 18,438  
Settlements   (4,464)  
Gain recognized in earnings (1,830) (712)  
Balance at the end of the period 13,262 13,262  
Net gain for the period included in earnings attributable to contingent consideration held at the end of the period: $ 1,830 $ 712