Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
Computation of basic and diluted earnings per share
Income from continuing operations	$ 8,757	$ 6,042
Income (loss) from discontinued operations, net of income taxes	(1,096)	53
Net income	7,661	6,095
Preferred stock dividends	0	514
Accretion of preferred stock redemption value	0	73
Excess of redemption value over carrying value of preferred stock redeemed	0	35,776
Undistributed net income (loss)	7,661	(30,268)
Undistributed net income (loss) allocated to preferred shareholders
Net income (loss) available to common shareholders/Net income (loss) applicable to preferred and common shareholders	$ 7,661	$ (30,268)
Shares:
Weighted average number of common shares outstanding - basic	34,456,380	34,170,628
Dilutive shares	1,049,398
Dilutive convertible preferred stock
Weighted-average number of common shares outstanding - diluted	35,505,778	34,170,628
Basic earnings per common share:
Continuing operations	$ 0.25	$ (0.89)
Discontinued operations	$ (0.03)	$ 0.00
Basic earnings per common share	$ 0.22	$ (0.89)
Diluted earnings per common share:
Continuing operations	$ 0.25	$ (0.89)
Discontinued operations	$ (0.03)	$ 0.00
Diluted earnings per common share	$ 0.22	$ (0.89)