Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
Beginning Balance (in shares) at Dec. 30, 2017		67,740,380			25,749,493
Beginning Balance at Dec. 30, 2017	$ 653,877	$ 677	$ 209,599	$ 1,611,158	$ (1,167,600)	$ (3,162)	$ 3,205
Net income (loss)	57,473			57,517			(44)
Dividends	(6,308)			(6,308)
Purchases of common stock (in shares)					14,354
Purchases of common stock	(1,508)				$ (1,508)
Issuance of stock related to stock-based compensation plans (in shares)		95,784			4,822
Issuance of stock related to stock-based compensation plans	(1,725)	$ 1	(1,376)		$ (350)
Stock-based compensation	3,710		3,710
Other comprehensive (loss) income	(12)					(389)	377
Ending Balance (in shares) at Mar. 31, 2018		67,836,164			25,768,669
Ending Balance at Mar. 31, 2018	706,280	$ 678	211,933	1,663,140	$ (1,169,458)	(3,551)	3,538
Adoption of accounting standards	773			773
Beginning Balance (in shares) at Dec. 29, 2018		67,870,962			27,755,001
Beginning Balance at Dec. 29, 2018	689,133	$ 679	226,852	1,841,279	$ (1,376,111)	(5,875)	2,309
Net income (loss)	63,300			63,317			(17)
Dividends	(6,629)			(6,629)
Purchases of common stock (in shares)					124,481
Purchases of common stock	(12,977)				$ (12,977)
Purchase of noncontrolling interests	(600)		1,842				(2,442)
Issuance of stock related to stock-based compensation plans (in shares)		176,079			5,199
Issuance of stock related to stock-based compensation plans	(7,604)	$ 1	(7,081)		$ (524)
Stock-based compensation	1,938		1,938
Other comprehensive (loss) income	1,699					1,549	$ 150
Ending Balance (in shares) at Mar. 30, 2019		68,047,041			27,884,681
Ending Balance at Mar. 30, 2019	$ 728,260	$ 680	$ 223,551	$ 1,897,967	$ (1,389,612)	$ (4,326)