Operating Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 31, 2010	Oct. 03, 2010	Jul. 04, 2010	Apr. 04, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of the total of the reportable segments' net income (loss) to consolidated financial statements
Operating income	$ 34,858	$ 51,863	$ 58,212	$ 42,073	$ 16,698	$ 41,586	$ 39,610	$ 31,295	$ 187,006	$ 129,189	$ 36,370
Interest expense									(48,126)	(49,826)	(41,962)
Interest income									1,011	1,184	1,043
Other income (expense)										1,465	(1,541)
Income tax expense									(24,638)	(12,714)	(1,175)
Income (loss) from continuing operations	26,989	31,365	34,881	22,018	10,739	22,644	21,585	14,330	115,253	69,298	(7,265)
Loss from discontinued operations, net of tax	(462)	(162)	(156)	(128)	849	(2,039)	(1,913)	(2,583)	(908)	(5,686)	(17,636)
Gain from disposal of discontinued operations, net of tax					44,847					44,847
Net income (loss)	26,527	31,203	34,725	21,890	56,435	20,605	19,672	11,747	114,345	108,459	(24,901)
Reportable Segment [Member]
Reconciliation of the total of the reportable segments' net income (loss) to consolidated financial statements
Operating income									254,260	175,279	67,914
Eliminations [Member]
Reconciliation of the total of the reportable segments' net income (loss) to consolidated financial statements
Operating income									$ (67,254)	$ (46,090)	$ (31,544)