Financing Arrangements-Interest (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
1% Sr. Convertible Notes due 2013 [Member]
Interest Cost Recognized For Convertible Notes
Contractual interest coupon				$ 3,481
Amortization of bond issuance costs				1,014
Amortization of bond discount				21,022
Total interest cost recognized				25,517
1.5% Sr. Convertible Notes due 2017 [Member]
Interest Cost Recognized For Convertible Notes
Contractual interest coupon	3,750	3,750	11,250	11,250
Amortization of bond issuance costs	667	667	2,000	2,000
Amortization of bond discount	10,558	9,859	31,248	29,180
Total interest cost recognized	14,975	14,276	44,498	42,430
0.5% Sr. Convertible Notes due 2020 [Member]
Interest Cost Recognized For Convertible Notes
Contractual interest coupon	1,875		5,625
Amortization of bond issuance costs	627		1,924
Amortization of bond discount	10,936		32,334
Total interest cost recognized	$ 13,438		$ 39,883