Income Taxes - Income before income taxes and Provision (benefit) for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income before income taxes
Domestic	$ 19,777	$ 9,700	$ 4,313
Foreign	52,384	67,203	60,183
Income before income taxes	72,161	76,903	64,496
Current:
Domestic	(8,843)	48,947	2,639
Foreign	5,888	7,077	4,421
Total Current	(2,955)	56,024	7,060
Deferred:
Domestic	(8,978)	(25,760)	(2,430)
Foreign	503	(453)	(1,628)
Total Deferred	(8,475)	(26,213)	(4,058)
Provision (benefit) for income taxes	$ (11,430)	$ 29,811	$ 3,002