LONG-TERM DEBT (Details) (USD $) In Thousands, unless otherwise specified					0 Months Ended	9 Months Ended				9 Months Ended						9 Months Ended
	Sep. 29, 2012	Dec. 31, 2011	Sep. 29, 2012 6.625% senior unsecured notes due in April 2020	Dec. 31, 2011 6.625% senior unsecured notes due in April 2020	Aug. 15, 2012 Revolving credit agreement	Sep. 29, 2012 Revolving credit agreement	Sep. 29, 2012 Revolving credit agreement LIBOR	Sep. 29, 2012 Revolving credit agreement LIBOR Minimum	Sep. 29, 2012 Revolving credit agreement LIBOR Maximum	Sep. 29, 2012 Revolving credit agreement Prime lending rate	Sep. 29, 2012 Revolving credit agreement Federal Funds rate	Sep. 29, 2012 Revolving credit agreement Federal Funds rate Minimum	Sep. 29, 2012 Revolving credit agreement Federal Funds rate Maximum	Sep. 29, 2012 IDR Bonds	Dec. 31, 2011 IDR Bonds	Sep. 29, 2012 1.75% to 3.485% notes	Dec. 31, 2011 1.75% to 3.485% notes
Long-term debt:
Total long-term debt	$ 473,453	$ 474,650	$ 450,000	$ 450,000										$ 8,500	$ 8,500	$ 1,890	$ 2,050
Unamortized premium on senior unsecured notes			13,063	14,100
Less current installments of long-term debt	226	235
Long-term debt, excluding current installments	473,227	474,415
Interest rate on notes (as a percent)			6.625%	6.625%
Interest rate on notes, low end of the range (as a percent)																1.75%
Interest rate on notes, high end of the range (as a percent)																3.485%
Aggregate principal amount			450,000
Term of multicurrency revolving credit agreement					5 years
Maximum borrowing capacity					400,000
Increase in borrowing capacity, maximum						200,000
Variable interest rate basis							LIBOR (based on a 1, 2, 3 or 6 month interest period)			Prime lending rate	Federal Funds Rate
Basis points added to variable rate (as a percent)								1.25%	2.25%		0.50%	0.25%	1.25%
Variable interest rate, base period							1 month
Additional borrowing capacity						384,866
Effective interest rate (as a percent)														0.34%	0.24%
Minimum aggregate maturities of long-term debt
2013	278
2014	268
2015	281
2016	$ 289