Income Taxes - Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Domestic (loss) income									$ (784)	$ 192	$ (7,346)
Foreign income									120,829	130,919	149,647
Income before taxes and equity earnings	$ 19,840	$ 39,542	$ 34,537	$ 26,126	$ 41,173	$ (3,049)	$ 57,449	$ 35,538	$ 120,045	$ 131,111	$ 142,301