Immaterial Reestatement of Goodwill - Schedule of Error Corrections and Prior Period Adjustments (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012		Dec. 31, 2011		Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Jul. 01, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Statement [Abstract]
Impairment of goodwill		$ (686)	$ 32,369								$ 47,294	$ 46,608	$ 51,157	$ 0	$ 0
Operating profit (loss)		9,503	(39,358)								(72,974)	(63,471)	(63,685)	(6,245)	291
Earnings (Loss) before income taxes		8,927	(40,160)								(74,405)	(65,478)	(66,464)	(8,489)	224
Net loss	(4,800)	7,689	(43,302)	(242,100)	[1]	(21,600)	[2]	700	(3,800)	(6,000)	(285,392)	(277,703)	(282,503)	(30,757)	(5,325)
Basic earnings (loss)	$ (0.08)	$ 0.13	$ (0.72)	$ (4.03)	[1]	$ (0.36)	[2]	$ 0.01	$ (0.06)	$ (0.10)	$ (4.75)	$ (4.61)	$ (4.68)	$ (0.51)	$ (0.09)
Diluted earnings (loss) (in dollars per share)	$ (0.08)	$ 0.13	$ (0.72)	$ (4.03)	[1]	$ (0.36)	[2]	$ 0.01	$ (0.06)	$ (0.10)	$ (4.75)	$ (4.61)	$ (4.68)	$ (0.51)	$ (0.09)
Other comprehensive income (loss), net of tax:
Net loss	(4,800)	7,689	(43,302)	(242,100)	[1]	(21,600)	[2]	700	(3,800)	(6,000)	(285,392)	(277,703)	(282,503)	(30,757)	(5,325)
Total comprehensive income (loss)		8,560	(50,959)								(291,656)	(283,096)	(289,970)	(56,117)	(19,758)
Statement of Financial Position [Abstract]
Goodwill	92,353	96,902	96,216			143,510					96,216	96,902	92,353	143,510	1,152
Total assets	556,270	570,167	560,802			869,290					560,802	570,167	556,270	869,290
Accumulated deficit	(492,830)	(488,028)	(495,719)			(210,327)					(495,719)	(488,028)	(492,830)	(210,327)
Total shareholders' equity	126,620	130,963	120,290			408,429					120,290	130,963	126,620	408,429	461,229	490,283
Statement of Cash Flows [Abstract]
Net loss	(4,800)	7,689	(43,302)	(242,100)	[1]	(21,600)	[2]	700	(3,800)	(6,000)	(285,392)	(277,703)	(282,503)	(30,757)	(5,325)
Impairment of goodwill		(686)	32,369								47,294	46,608	51,157	0	0
Previously Reported
Income Statement [Abstract]
Impairment of goodwill		(200)	26,589								41,514	41,314
Operating profit (loss)		9,017	(33,578)								(67,194)	(58,177)
Earnings (Loss) before income taxes		8,441	(34,380)								(68,625)	(60,184)
Net loss		7,203	(37,522)								(279,612)	(272,409)
Basic earnings (loss)		$ 0.12	$ (0.62)								$ (4.65)	$ (4.52)
Diluted earnings (loss) (in dollars per share)		$ 0.12	$ (0.62)								$ (4.65)	$ (4.52)
Other comprehensive income (loss), net of tax:
Net loss		7,203	(37,522)								(279,612)	(272,409)
Total comprehensive income (loss)		8,074	(45,179)								(285,876)	(277,802)
Statement of Financial Position [Abstract]
Goodwill		102,196	101,996								101,996	102,196
Total assets		575,461	566,582								566,582	575,461
Accumulated deficit		(482,734)	(489,939)								(489,939)	(482,734)
Total shareholders' equity		136,257	126,070								126,070	136,257
Statement of Cash Flows [Abstract]
Net loss		7,203	(37,522)								(279,612)	(272,409)
Impairment of goodwill		$ (200)	$ 26,589								$ 41,514	$ 41,314

[1] In the first quarter of 2012, we recognized expense of $206.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.

[2] In the fourth quarter of 2011, we recorded an expense of $20.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.