Quarterly report pursuant to Section 13 or 15(d)

Debt - Fair Value of Debt (Details)

v3.10.0.1
Debt - Fair Value of Debt (Details) - USD ($)
$ in Thousands
Jun. 28, 2018
Dec. 28, 2017
Debt Instrument [Line Items]    
Total debt at par value $ 164,350 $ 193,500
Less: unamortized discount and debt issuance costs 4,052 4,438
Net carrying amount 160,298 189,062
Level 3    
Debt Instrument [Line Items]    
Fair value $ 164,350 $ 193,881