Consolidated Statements of Equity - USD ($) $ in Thousands	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	Cumulative Effect, Period of Adoption, Adjustment Retained earnings
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		$ 659,241	$ (648)	$ 246,833		$ (144,805)
Balance at beginning of period (ASU 2016-02) at Dec. 31, 2018													$ 761
Increase (Decrease) in Stockholders' Equity
Shares issued for exercise/vesting of share-based compensation awards, shares				470,547
Shares issued for exercise/vesting of share-based compensation awards				$ 5		1,477
Shares repurchased, shares			(1,192,419)
Shares repurchased				$ (12)				(19,982)
Shares surrendered for tax obligations for employee share-based transactions, shares				(45,830)
Shares surrendered for tax obligations for employee share-based transactions				$ (1)		(918)
Amortization of share-based compensation						6,360
Distributions/ net issuances							(13)
Net income	$ 38,133							38,133
Foreign currency adjustments	(1,967)									(1,967)
Unrealized gain on interest rate hedges	1,113										$ 1,113
Net actuarial pension gain	2,882											$ 2,882
Balance at end of period at Jun. 29, 2019	789,472	$ 0		$ 1,005	$ 665,499	666,160	(661)	265,745	$ (142,777)
Balance at period end, shares at Jun. 29, 2019		0		100,543,160
Balance at beginning of period, shares at Mar. 30, 2019				100,664,822
Balance at beginning of period at Mar. 30, 2019				$ 1,007		662,837	(654)	248,381	(154,847)
Increase (Decrease) in Stockholders' Equity
Shares issued for exercise/vesting of share-based compensation awards, shares				167,454
Shares issued for exercise/vesting of share-based compensation awards				$ 2		190
Shares repurchased, shares			(252,621)
Shares repurchased				$ (3)				(4,992)
Shares surrendered for tax obligations for employee share-based transactions, shares				(36,495)
Shares surrendered for tax obligations for employee share-based transactions				$ (1)		(754)
Amortization of share-based compensation						3,887
Distributions/ net issuances							(7)
Net income	22,356							22,356
Foreign currency adjustments	10,079
Unrealized gain on interest rate hedges	563
Net actuarial pension gain	1,428
Balance at end of period at Jun. 29, 2019	789,472	$ 0		$ 1,005	665,499	666,160	(661)	265,745	(142,777)
Balance at period end, shares at Jun. 29, 2019		0		100,543,160
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	$ 0		$ 1,007		672,445	(673)	290,583		(151,275)
Balance at beginning of period (ASU 2016-13) at Dec. 31, 2019													$ (5,710)
Increase (Decrease) in Stockholders' Equity
Shares issued for exercise/vesting of share-based compensation awards, shares				175,140
Shares issued for exercise/vesting of share-based compensation awards				$ 2		77
Shares repurchased, shares			(265,589)
Shares repurchased				$ (3)				(4,997)
Shares surrendered for tax obligations for employee share-based transactions, shares				(24,296)
Shares surrendered for tax obligations for employee share-based transactions				$ (1)		(464)
Amortization of share-based compensation						8,896
Distributions/ net issuances							0
Net income	22,867							22,867
Foreign currency adjustments	(3,743)									$ (3,743)
Unrealized gain on interest rate hedges	(1,256)										$ (1,256)
Net actuarial pension gain	2,847											$ 2,847
Balance at end of period at Jun. 27, 2020	830,602	$ 0		$ 1,005	680,281	680,954	(673)	302,743	(153,427)
Balance at period end, shares at Jun. 27, 2020		0		100,553,258
Balance at beginning of period, shares at Mar. 28, 2020				100,487,485
Balance at beginning of period at Mar. 28, 2020				$ 1,005		675,941	(673)	279,646	(202,151)
Increase (Decrease) in Stockholders' Equity
Shares issued for exercise/vesting of share-based compensation awards, shares				80,669
Shares issued for exercise/vesting of share-based compensation awards				$ 1		77
Shares repurchased, shares			0
Shares repurchased								0
Shares surrendered for tax obligations for employee share-based transactions, shares				(14,896)
Shares surrendered for tax obligations for employee share-based transactions				$ (1)		(227)
Amortization of share-based compensation						5,163
Distributions/ net issuances							0
Net income	23,097							23,097
Foreign currency adjustments	49,896
Unrealized gain on interest rate hedges	(1,256)
Net actuarial pension gain	84
Balance at end of period at Jun. 27, 2020	$ 830,602	$ 0		$ 1,005	$ 680,281	$ 680,954	$ (673)	$ 302,743	$ (153,427)
Balance at period end, shares at Jun. 27, 2020		0		100,553,258