Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Feb. 28, 2012	May. 31, 2009
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Net income (loss) attributable to stockholders	$ 6,509	$ 14,102	$ (3,072)	$ 79,146
Basic weighted-average common shares (in shares)	134,376,000	129,747,000	133,205,000	125,972,000
Basic (in dollars per share)	$ 0.05	$ 0.11	$ (0.02)	$ 0.63
Interest expense incurred on debentures	$ 512	$ 551
Net income (loss) available to common stockholders	$ 7,021	$ 14,653	$ (3,072)	$ 80,328
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Diluted weighted-average common shares	(156,995,000)	(156,333,000)	(133,205,000)	(154,886,000)
Dilutive net income (loss) per share	$ 0.04	$ 0.09	$ (0.02)	$ 0.52
Stock options [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share	149,000	139,000	185,000	149,000
Restricted stock units [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share	293,000	293,000	1,776,000	379,000
Upfront Warrants (held by Total) [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share	0	0	7,055,000	0
Warrants (Under the CSO2015) [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share	0	0	1,827,000	0
0.875% debentures due 2021 [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share	8,203,000	1,713,000	8,203,000	0
4.75% debentures due 2014 [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share		1,330,000		5,021,000
0.75% debentures due 2018 [Member]
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Interest expense incurred on debentures			$ 0	$ 1,001
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Debentures due	12,026,000	12,026,000	0	12,026,000
Outstanding anti-dilutive potential common stock excluded from income (loss) per diluted share	0	0	12,000	0
4.75% debentures due 2014 [Member]
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Interest expense incurred on debentures	$ 0	$ 0	$ 0	$ 181
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Debentures due	0	0	0	857,000
4.75% debentures due 2014 [Member] | Maximum [Member] | Warrant (Under the CSO2014) [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Warrant or right, number of securities called by each warrant or right (in shares)	8,700,000		8,700,000
Upfront Warrants (held by Total) [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Warrants	7,201,000	7,278,000	0	7,253,000
Upfront Warrants (held by Total) [Member] | Total [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Warrant or right, number of securities called by each warrant or right (in shares)					9,531,677
Class of warrant or right, exercise price of warrants or rights (in dollars per share)					$ 7.8685
Warrants (Under the CSO2015) [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Warrants	1,873,000	3,094,000	0	3,004,000
Class of warrant or right, exercise price of warrants or rights (in dollars per share)	$ 24.00		$ 24.00
Warrant (Under the CSO2014) [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Warrants	0	0	0	524,000
Class of warrant or right, exercise price of warrants or rights (in dollars per share)	$ 26.40		$ 26.40			$ 26.40
Warrant (Under the CSO2014) [Member] | Maximum [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Warrant or right, number of securities called by each warrant or right (in shares)	8,700,000		8,700,000
Stock options [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Restricted stock units	36,000	93,000	0	101,000
Restricted stock units [Member]
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Restricted stock units	1,483,000	4,095,000	0	5,149,000