Segment Information - Selected Financial Informaion by Geographical Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011		Jul. 02, 2011		Apr. 02, 2011	Dec. 31, 2010		Oct. 02, 2010		Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue (origin):
Revenues	$ 226,987	$ 215,988	[1]	$ 228,785	[2]	$ 224,323	$ 253,389	[3]	$ 236,998	[4]	$ 207,478	$ 180,838	$ 896,083	$ 878,703	$ 654,301
Income from operations:
Income from operations													59,026	116,140	16,627
Property, plant and equipment, net:
Property, plant and equipment, net	469,943						352,188						469,943	352,188
United States [Member]
Revenue (origin):
Revenues													896,083	878,703	654,301
Property, plant and equipment, net:
Property, plant and equipment, net	435,423						321,597						435,423	321,597
Costa Rica [Member]
Revenue (origin):
Revenues													31,295	25,947	23,252
Income from operations:
Income from operations													3,494	1,766	1,858
Property, plant and equipment, net:
Property, plant and equipment, net	29,707						26,774						29,707	26,774
Other [Member]
Property, plant and equipment, net:
Property, plant and equipment, net	4,813						3,817						4,813	3,817
United States and other [Member]
Income from operations:
Income from operations													59,026	116,140	16,627
Eliminations [Member]
Revenue (origin):
Revenues													(31,295)	(25,947)	(23,252)
Income from operations:
Income from operations													$ (3,494)	$ (1,766)	$ (1,858)

[1] During the third quarter of 2011, the Company recorded a tax benefit of $5,811 resulting from the release of certain liabilities due to the expiration of statute of limitations and the recognition of additional tax credits for 2010 related to R&E spending.

[2] During the second quarter of 2011, the Company recorded a tax benefit of $2,183 resulting from the release of certain liabilities due to the expiration of statute of limitations.

[3] During the fourth quarter of 2010, the Company received $1,340 for the recovery of a previously impaired investment. The Company also recorded a tax benefit of $4,436 primarily due to the recognition of a deferred tax asset related to R&E credits resulting from a change in the tax legislation that was passed at the end of 2010.

[4] During the third quarter of 2010, the Company recorded a tax benefit of $73,367 due to the release of the valuation allowance.