Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 02, 2015	Sep. 26, 2014	Oct. 02, 2015	Sep. 26, 2014
Statement of Comprehensive Income [Abstract]
Net earnings		$ 17,224	$ 14,779	$ 51,664	$ 42,809
Foreign currency translation adjustments		(1,109)	(5,766)	(3,945)	(4,306)
Unrealized gain on derivative instruments, net of tax expense of $38 and $6 and $134 and $47, respectively	[1]	62	6	221	75
Change in pension and post-retirement benefit plan liabilities, net of tax expense of $961 and $405 and $2,883 and $1,215, respectively	[2]	1,587	669	4,763	2,006
Other Comprehensive Income (Loss)		540	(5,091)	1,039	(2,225)
Comprehensive Income		$ 17,764	$ 9,688	$ 52,703	$ 40,584

[1] See Note 7, Derivative Financial Instruments, for additional information regarding our derivative instruments.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 11, Pension Plans for additional information.)