CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interest [Member]
Beginning Balance at Jan. 01, 2011	$ 408,456	$ 44,841	$ 18,011	$ 343,474	$ 1,659	$ 471
Comprehensive income:
Net income	45,748			45,986		(238)
Other comprehensive income (net of tax)	56				56
Distributions to noncontrolling interest	(87)					(87)
Change in ownership of noncontrolling interest	119					119
Cash dividends	(41,250)			(41,250)
Common shares – treasury:
Shares purchased	(10,000)	(324)	(9,676)
Shares issued under Members’ Stock Purchase Plan and stock awards	16,280	338	15,942
Ending Balance at Dec. 31, 2011	419,322	44,855	24,277	348,210	1,715	265
Comprehensive income:
Net income	48,326			48,967		(641)
Other comprehensive income (net of tax)	(402)				(402)
Distributions to noncontrolling interest	(124)					(124)
Change in ownership of noncontrolling interest	607			(194)		801
Cash dividends	(43,041)			(43,041)
Common shares – treasury:
Shares purchased	(21,021)	(800)	(20,221)
Shares issued under Members’ Stock Purchase Plan and stock awards	16,993	896	16,097
Ending Balance at Dec. 29, 2012	420,660	44,951	20,153	353,942	1,313	301
Comprehensive income:
Net income	63,369			63,683		(314)
Other comprehensive income (net of tax)	(348)				(348)
Distributions to noncontrolling interest	(167)					(167)
Change in ownership of noncontrolling interest	(210)			(479)		269
Cash dividends	(43,494)			(43,494)
Common shares – treasury:
Shares purchased	(27,488)	(740)	(26,748)
Shares issued under Members’ Stock Purchase Plan and stock awards	24,095	771	23,324
Ending Balance at Dec. 28, 2013	$ 436,417	$ 44,982	$ 16,729	$ 373,652	$ 965	$ 89