Segment and Geographic Information - Summarized Financial Information by Business Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Oct. 02, 2015 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of operating segments | segment			2
Net sales	$ 453,474	$ 433,742	$ 1,375,314	$ 1,322,848
Operating income	31,062	29,783	79,259	82,544
Net gain/(loss) on sale of assets	(24)	10	(10)	415
Interest expense, net	4,165	3,208	11,960	9,757
Other expense (income), net	(332)	185	243	120
Earnings before income taxes	27,229	26,390	67,056	72,667
Income tax expense	9,774	9,166	23,329	21,003
Net earnings	17,455	17,224	43,727	51,664
Distribution [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	274,388	296,312	849,104	911,832
Operating income	11,872	14,422	36,148	42,789
Aerospace [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	179,086	137,430	526,210	411,016
Operating income	29,616	27,801	81,374	78,775
Unallocated Amount to Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net gain/(loss) on sale of assets	(24)	10	(10)	415
Corporate Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (10,402)	$ (12,450)	$ (38,253)	$ (39,435)