Consolidated Statement of Changes in Equity - 6 months ended Jun. 30, 2018 - 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)	119,965			120,040			(75)
Dividends	(12,496)			(12,496)
Purchases of common stock (in shares)					1,000,000
Purchases of common stock	(105,488)				$ (105,488)
Issuance of stock related to stock-based compensation plans (in shares)		107,312			5,317
Issuance of stock related to stock-based compensation plans	(1,773)	$ 1	(1,373)		$ (401)
Stock-based compensation	8,102		8,102
Other comprehensive (loss) income	(2,027)					(2,122)	95
Ending Balance (in shares) at Jun. 30, 2018		67,847,692			26,754,810
Ending Balance at Jun. 30, 2018	660,933	$ 678	$ 216,328	1,719,475	$ (1,273,489)	$ (5,284)	$ 3,225
Adoption of accounting standards (Note 12) | Accounting Standards Update 2014-09	$ 773			$ 773