Accrued Expenses (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017
Accrued Expenses [Abstract]
Accrued payroll	$ 38,384	$ 38,296
Accrued rebates	29,579	34,488
Accrued interest	2,328	10,688
Other accruals	44,163	43,287
Total accrued expenses	$ 114,454	$ 126,759