Business Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Pre-Tax Income Reconciliation of Segments
Total operating income from segments	$ 78,750	$ 79,070	$ 152,049	$ 146,153
Unallocated Amount:
General and Administrative Expenses	(27,363)	(26,129)	(59,403)	(52,715)
Net Interest Expense	(19,938)	(18,857)	(38,095)	(37,856)
Loss on extinguishment of debt	(5,527)	0	(5,527)	0
Income before income taxes, equity in earnings of affiliates and discontinued operations	$ 25,922	$ 34,084	$ 49,024	$ 55,582