Shareholders' Equity (Details) (USD $)	3 Months Ended								3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011	Apr. 01, 2012 Common Stock [Member]	Apr. 01, 2012 Additional Paid-in Capital [Member]	Apr. 01, 2012 Retained Earnings [Member]	Apr. 01, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Apr. 01, 2012 Treasury Stock [Member]	Jan. 01, 2012 Treasury Stock [Member]	Apr. 01, 2012 Noncontrolling Interest [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 1,038,521,000		$ 852,000	$ 727,297,000	$ 507,170,000	$ 1,930,000	$ (214,031,000)	$ (214,031,000)	$ 15,303,000
Beginning Balance, Shares			61,181,000				24,004,000	24,004,000
Stock option and restricted stock award transactions, shares			324,000
Stock option and restricted stock award transactions	231,000		3,000	228,000
Tax provision related to equity compensation	(342,000)			(342,000)
Stock based compensation expense	1,506,000			1,506,000
Cancellation of restricted stock, Shares			(12,000)
Cancellation of restricted stock, Amount	0		0	0
Retirement of common stock, shares	57,457
Retirement of common stock, Value	(1,035,000)		(1,000)	(628,000)	(406,000)
Distribution to noncontrolling interest	(5,758,000)								(5,758,000)
Comprehensive income (loss):
Total comprehensive income	17,046,000	16,685,000			15,025,000	1,959,000			62,000
Ending Balance	$ 1,050,169,000		$ 854,000	$ 728,061,000	$ 521,789,000	$ 3,889,000	$ (214,031,000)	$ (214,031,000)	$ 9,607,000
Ending Balance, Shares			61,435,000				24,004,000	24,004,000