Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock	Noncontrolling Interests in Subsidiaries	Total
Balance at Dec. 28, 2014	$ 433	$ 147,912	$ 671	$ 92,876	$ (155,659)	$ 12,482	$ 98,715
Balance (in shares) at Dec. 28, 2014	39,782,000
Net income attributable to the Company				75,682		2,409	78,091
Other comprehensive income (loss)			(2,507)				(2,507)
Cash dividends paid		100		(24,834)			(24,734)
Exercise of stock options	$ 3	5,194					$ 5,197
Exercise of stock options (in shares)	320,000						441,000
Tax effect of equity awards		(830)					$ (830)
Acquisition of Company common stock					(119,793)		(119,793)
Acquisition of Company common stock (in shares)	(1,845,000)
Stock-based compensation expense		9,423					9,423
Issuance of restricted stock	$ 1	(3,232)			3,231
Issuance of restricted stock (in shares)	151,000
Change in redemption value of noncontrolling interests				65			65
Contributions from noncontrolling interests						684	684
Distributions to noncontrolling interests						(2,550)	(2,550)
Other		(219)			664		445
Other (in shares)	15,000
Balance at Dec. 27, 2015	$ 437	158,348	(1,836)	143,789	(271,557)	13,025	42,206
Balance (in shares) at Dec. 27, 2015	38,423,000
Net income attributable to the Company				102,820		2,607	105,427
Other comprehensive income (loss)			(4,051)				(4,051)
Cash dividends paid		119		(27,898)			(27,779)
Exercise of stock options	$ 3	7,056					$ 7,059
Exercise of stock options (in shares)	334,000						478,000
Tax effect of equity awards		(7)					$ (7)
Acquisition of Company common stock					(122,381)		(122,381)
Acquisition of Company common stock (in shares)	(2,145,000)
Stock-based compensation expense		10,123					10,123
Issuance of restricted stock	$ 1	(2,975)			2,974
Issuance of restricted stock (in shares)	58,000
Change in redemption value of noncontrolling interests				567			567
Contributions from noncontrolling interests						690	690
Distributions to noncontrolling interests						(2,610)	(2,610)
Other		(91)			648		557
Other (in shares)	13,000
Balance at Dec. 25, 2016	$ 441	172,573	(5,887)	219,278	(390,316)	13,712	9,801
Balance (in shares) at Dec. 25, 2016	36,683,000
Net income attributable to the Company				102,292		2,038	104,330
Other comprehensive income (loss)			3,770				3,770
Cash dividends paid		136		(30,728)			(30,592)
Exercise of stock options	$ 1	6,259					$ 6,260
Exercise of stock options (in shares)	147,000						147,000
Tax effect of equity awards		(2,428)					$ (2,428)
Acquisition of Company common stock					(209,586)		(209,586)
Acquisition of Company common stock (in shares)	(2,960,000)
Stock-based compensation expense		10,413					10,413
Issuance of restricted stock		(2,427)			2,427
Issuance of restricted stock (in shares)	54,000
Change in redemption value of noncontrolling interests				1,419			1,419
Contributions from noncontrolling interests						2,956	2,956
Distributions to noncontrolling interests						(2,949)	(2,949)
Other		259		(10)	403		652
Other (in shares)	7,000
Balance at Dec. 31, 2017	$ 442	$ 184,785	$ (2,117)	$ 292,251	$ (597,072)	$ 15,757	$ (105,954)
Balance (in shares) at Dec. 31, 2017	33,931,000