Consolidated Statements of Equity - USD ($)	Total	Preferred stock	Common stock	Common stock Common Class A	Additional paid-in capital	Other Additional paid in capital	Other Additional paid in capital Employee stock notes	Retained earnings	Accumulated other comprehensive income (loss)	Foreign currency adjustments	Unrealized (loss) gain on interest rate hedges	Net actuarial pension (loss) gain
Balance at beginning of period, shares at Dec. 31, 2018		0		101,310,862
Balance at beginning of period at Dec. 31, 2018		$ 0		$ 1,013,000		$ 659,241,000	$ (648,000)	$ 246,833,000		$ (144,805,000)
Increase (Decrease) in Stockholders' Equity
Shares issued for exercise/vesting of share-based compensation awards, shares				303,093
Shares issued for exercise/vesting of share-based compensation awards				$ 3,000		1,287,000
Shares repurchased, shares			(939,798)
Shares repurchased			$ (15,000,000.0)	$ (9,000)				(14,990,000)
Shares surrendered for tax obligations for employee share-based transactions, shares				(9,335)
Shares surrendered for tax obligations for employee share-based transactions				$ 0		(164,000)
Amortization of share-based compensation						2,473,000
Distributions/ net issuances							(6,000)
Net income	$ 15,777,000							15,777,000
Foreign currency adjustments	(12,046,000)									(12,046,000)
Unrealized gain on interest rate hedges	550,000										$ 550,000
Net actuarial pension gain	1,454,000											$ 1,454,000
Balance at end of period at Mar. 30, 2019	756,724,000			$ 1,007,000	$ 662,183,000	662,837,000	(654,000)	248,381,000	$ (154,847,000)
Balance at period end, shares at Mar. 30, 2019				100,664,822
Balance at beginning of period, shares at Dec. 31, 2019		0		100,668,003
Balance at beginning of period at Dec. 31, 2019	812,087,000	$ 0		$ 1,007,000		672,445,000	(673,000)	290,583,000		(151,275,000)
Increase (Decrease) in Stockholders' Equity
Shares issued for exercise/vesting of share-based compensation awards, shares				94,471
Shares issued for exercise/vesting of share-based compensation awards				$ 1,000		0
Shares repurchased, shares			(265,589)
Shares repurchased			$ (5,000,000.0)	$ (3,000)				(4,997,000)
Shares surrendered for tax obligations for employee share-based transactions, shares				(9,400)
Shares surrendered for tax obligations for employee share-based transactions				$ 0		(237,000)
Amortization of share-based compensation						3,733,000
Distributions/ net issuances							0
Net income	(230,000)							(230,000)
Foreign currency adjustments	(53,639,000)									$ (53,639,000)
Unrealized gain on interest rate hedges	0
Net actuarial pension gain	2,763,000											$ 2,763,000
Balance at end of period at Mar. 28, 2020	$ 753,768,000			$ 1,005,000	$ 675,268,000	$ 675,941,000	$ (673,000)	$ 279,646,000	$ (202,151,000)
Balance at period end, shares at Mar. 28, 2020				100,487,485