Income Taxes Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Income Taxes [Abstract]
Expected federal income tax expense (benefit) at statutory rate	$ 9,621	$ (1,693)	$ 27,256	$ (8,171)
Effect of foreign source income	(5,858)	(3,460)	(14,133)	(12,958)
Effect of foreign dividend	0	1,800	0	(2,936)
Valuation allowance	508	0	1,542	0
Nondeductible acquisition costs	0	(353)	0	1,503
Other items, net	(253)	(104)	268	550
Income tax expense (benefit)	$ 4,018	$ (3,810)	$ 14,933	$ (22,012)