Shareholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			$ 1,038,521,000
Stock option and restricted stock award transactions			396,000
Tax provision related to equity compensation			(270,000)
Stock based compensation expense			3,494,000
Cancellation of restricted stock, Value			0
Retirement of common stock, shares			(57,457)
Retirement of common stock, Value			(1,035,000)
Stock Issued During Period, Value, Treasury Stock Reissued			296,000
Distribution to noncontrolling interest			(5,758,000)
Adjustments to Additional Paid in Capital, Other			(51,000)
Comprehensive income (loss):
Total comprehensive income	20,007,000	21,662,000	37,053,000	38,345,000
Ending Balance	1,072,646,000		1,072,646,000
Common Stock [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			852,000
Beginning Balance, Shares			61,181,000
Stock option and restricted stock award transactions, shares			347,000
Stock option and restricted stock award transactions			3,000
Cancellation of restricted stock, shares			(26,000)
Cancellation of restricted stock, Value			0
Retirement of common stock, shares			(58,000)
Retirement of common stock, Value			(1,000)
Stock Issued During Period, Shares, Treasury Stock Reissued			16,000
Comprehensive income (loss):
Ending Balance	854,000		854,000
Ending Balance, Shares	61,460,000		61,460,000
Additional Paid-in Capital [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			727,297,000
Stock option and restricted stock award transactions			393,000
Tax provision related to equity compensation			(270,000)
Stock based compensation expense			3,494,000
Cancellation of restricted stock, Value			0
Retirement of common stock, Value			(628,000)
Stock Issued During Period, Value, Treasury Stock Reissued			0
Adjustments to Additional Paid in Capital, Other			(51,000)
Comprehensive income (loss):
Ending Balance	730,235,000		730,235,000
Retained Earnings [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			507,170,000
Retirement of common stock, Value			(406,000)
Stock Issued During Period, Value, Treasury Stock Reissued			0
Comprehensive income (loss):
Total comprehensive income			37,526,000
Ending Balance	544,290,000		544,290,000
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			1,930,000
Comprehensive income (loss):
Total comprehensive income			(477,000)
Ending Balance	1,453,000		1,453,000
Treasury Stock [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			(214,031,000)
Beginning Balance, Shares			24,004,000
Stock Issued During Period, Value, Treasury Stock Reissued			296,000
Stock Issued During Period, Shares, Treasury Stock Reissued			(16,000)
Comprehensive income (loss):
Ending Balance	(213,735,000)		(213,735,000)
Ending Balance, Shares	23,988,000		23,988,000
Noncontrolling Interest [Member]
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance			15,303,000
Distribution to noncontrolling interest			(5,758,000)
Comprehensive income (loss):
Total comprehensive income			4,000
Ending Balance	$ 9,549,000		$ 9,549,000