Financing Arrangements-Carrying Value and Interest (Details 1) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jan. 01, 2012	Sep. 30, 2012 1% Sr. Convertible Notes due 2013 [Member]	Oct. 02, 2011 1% Sr. Convertible Notes due 2013 [Member]	Sep. 30, 2012 1% Sr. Convertible Notes due 2013 [Member]	Oct. 02, 2011 1% Sr. Convertible Notes due 2013 [Member]	Jan. 01, 2012 1% Sr. Convertible Notes due 2013 [Member]	May 31, 2006 1% Sr. Convertible Notes due 2013 [Member]	Sep. 30, 2012 1.5% Sr. Convertible Notes due 2017 [Member]	Oct. 02, 2011 1.5% Sr. Convertible Notes due 2017 [Member]	Sep. 30, 2012 1.5% Sr. Convertible Notes due 2017 [Member]	Oct. 02, 2011 1.5% Sr. Convertible Notes due 2017 [Member]	Jan. 01, 2012 1.5% Sr. Convertible Notes due 2017 [Member]	Aug. 31, 2010 1.5% Sr. Convertible Notes due 2017 [Member]
Carrying value of the convertible debt
Convertible debt, par value			$ 928,061		$ 928,061		$ 928,061	$ 1,150,000	$ 1,000,000		$ 1,000,000		$ 1,000,000	$ 1,000,000
Unamortized interest discount			(35,377)		(35,377)		(75,915)		(219,536)		(219,536)		(247,235)
Convertible debt, carrying value	1,673,148	1,604,911	892,684		892,684		852,146		780,464		780,464		752,765
Convertible short-term debt, carrying value	(892,684)	0
Convertible long-term debt, carrying value	780,464	1,604,911
Interest cost recognized for Convertible notes
Contractual interest coupon			2,319	2,504	6,959	8,254			3,750	3,750	11,250	11,250
Amortization of bond issuance costs			695	1,935	2,087	3,649			667	667	2,000	2,028
Amortization of bond discount			13,515	13,456	39,816	43,743			9,170	8,594	27,111	25,505
Total interest cost recognized			$ 16,529	$ 17,895	$ 48,862	$ 55,646			$ 13,587	$ 13,011	$ 40,361	$ 38,783