CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning balance at Dec. 31, 2016	$ 501,009	$ 44,079	$ 0	$ 461,524	$ (5,000)	$ 406
Comprehensive income:
Net income (loss)	4,781			4,837		(56)
Other comprehensive income (loss), net of tax	627				627
Change in ownership of non-controlling interest	0			0		0
Cash dividends	(12,132)			(12,132)
Common shares – treasury:
Shares purchased	(11,675)	(234)	(6,602)	(4,839)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	18,850	395	18,455
Ending balance at Apr. 01, 2017	501,460	44,240	11,853	449,390	(4,373)	350
Beginning balance at Dec. 30, 2017	514,577	43,354	7,029	467,296	(3,611)	509
Comprehensive income:
Net income (loss)	2,461			2,510		(49)
Other comprehensive income (loss), net of tax	949				949
Change in ownership of non-controlling interest	0			(41)		41
Cash dividends	(12,381)			(12,381)
Common shares – treasury:
Shares purchased	(5,964)	(153)	(1,175)	(4,636)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	14,599	329	14,270
Ending balance at Mar. 31, 2018	$ 514,241	$ 43,530	$ 20,124	$ 452,748	$ (2,662)	$ 501