Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Net income	$ 30,802	$ 11,324	$ 77,243	$ 60,003
Other comprehensive income (loss):
Pension liability adjustments (net of tax of $30 and $7 for the three months ended 2016 and 2015, and $395 and $49 for the nine months ended 2016 and 2015, respectively)	(138)	(16)	(183)	(140)
Reclassification adjustments to expense, (net of tax of $0 and $1,244, for the three months ended 2016 and 2015, and $0 and $746 for the nine months ended 2016 and 2015, respectively)	68	(514)	212	1,457
Reclassification of pension settlement costs to expense (net of tax of $11,742 for the three and nine months ended 2015)		21,124		21,124
Unrealized (loss) gain on investments	927	(3,354)	(559)	(18)
Foreign currency translation adjustments	(5,771)	(26,377)	(8,951)	(36,530)
Comprehensive income	$ 25,888	$ 2,187	$ 67,762	$ 45,896