Earnings per Share (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares	Sep. 24, 2017 USD ($) $ / shares	Jun. 25, 2017 USD ($) $ / shares	Mar. 26, 2017 USD ($) $ / shares	Dec. 25, 2016 USD ($) $ / shares	Sep. 25, 2016 USD ($) $ / shares	Jun. 26, 2016 USD ($) $ / shares	Mar. 27, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) item $ / shares shares	Dec. 25, 2016 USD ($) $ / shares shares	Dec. 27, 2015 USD ($) $ / shares shares
Earnings per Share
Number of joint ventures for which the increase in redemption value for the noncontrolling interest reduces income attributable to common shareholders | item									1
Basic earnings per common share:
Net income attributable to the Company | $	$ 28,509	$ 21,817	$ 23,538	$ 28,428	$ 32,630	$ 21,467	$ 22,541	$ 26,182	$ 102,292	$ 102,820	$ 75,682
Change in noncontrolling interest redemption value | $									1,419	567	65
Net income attributable to participating securities | $									(423)	(420)	(325)
Net income attributable to common shareholders | $									$ 103,288	$ 102,967	$ 75,422
Weighted average common shares outstanding | shares									36,083,000	37,253,000	39,458,000
Basic earnings per common share | $ / shares	$ 0.82	$ 0.61	$ 0.66	$ 0.78	$ 0.89	$ 0.57	$ 0.61	$ 0.69	$ 2.86	$ 2.76	$ 1.91
Diluted earnings per common share:
Net income attributable to common shareholders | $									$ 103,288	$ 102,967	$ 75,422
Weighted average common shares outstanding | shares									36,083,000	37,253,000	39,458,000
Dilutive effect of outstanding equity awards | shares									439,000	355,000	542,000
Diluted weighted average common shares outstanding | shares									36,522,000	37,608,000	40,000,000
Diluted earnings per common share | $ / shares	$ 0.81	$ 0.60	$ 0.65	$ 0.77	$ 0.88	$ 0.57	$ 0.61	$ 0.69	$ 2.83	$ 2.74	$ 1.89
Weighted average antidilutive awards excluded from computation of earnings per share | shares									278,000	331,000	251,000