CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning Balance at Jan. 02, 2016	$ 477,299	$ 44,158	$ 4,407	$ 433,575	$ (5,186)	$ 345
Comprehensive income:
Net income (loss)	85,638			85,577		61
Other comprehensive income (loss), net of tax	186				186
Change in ownership of non-controlling interest	(89)			(89)
Cash dividends	(48,495)			(48,495)
Common shares – treasury:
Shares purchased	(55,825)	(1,082)	(45,699)	(9,044)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	42,295	1,003	41,292
Ending Balance at Dec. 31, 2016	501,009	44,079	0	461,524	(5,000)	406
Comprehensive income:
Net income (loss)	89,898			89,795		103
Other comprehensive income (loss), net of tax	1,389				1,389
Change in ownership of non-controlling interest	0
Cash dividends	(49,557)			(49,557)
Common shares – treasury:
Shares purchased	(58,887)	(1,463)	(22,958)	(34,466)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	30,725	738	29,987
Ending Balance at Dec. 30, 2017	514,577	43,354	7,029	467,296	(3,611)	509
Comprehensive income:
Net income (loss)	93,326			93,377		(51)
Other comprehensive income (loss), net of tax	12				12
Change in ownership of non-controlling interest	(175)			(43)		(132)
Cash dividends	(51,085)			(51,085)
Common shares – treasury:
Shares purchased	(29,424)	(755)	(24,033)	(4,636)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	36,028	983	35,045
Ending Balance at Dec. 29, 2018	$ 563,259	$ 43,582	$ 18,041	$ 504,909	$ (3,599)	$ 326