Segment and Geographic Information - Summarized Financial Information by Business Segment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 29, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of operating segments | segment			2
Net sales	$ 468,129	$ 449,006	$ 931,456	$ 884,947
Net gain (loss) on sale of assets	1,525	(15)	1,588	5
Operating income	20,875	26,526	41,599	40,015
Interest expense, net	5,002	6,122	10,354	10,282
Non-service pension and post retirement benefit cost (income)	(3,039)	(866)	(6,068)	(1,585)
Other expense (income), net	361	(69)	19	(228)
Earnings before income taxes	18,551	21,339	37,294	31,546
Income tax expense	3,457	7,881	8,134	11,797
Net earnings	15,094	13,458	29,160	19,749
Distribution
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	289,523	278,706	573,455	550,324
Aerospace
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	178,606	170,300	358,001	334,623
Operating segments | Distribution
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	289,523	278,706	573,455	550,324
Operating income	13,546	15,657	25,380	27,073
Operating segments | Aerospace
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	178,606	170,300	358,001	334,623
Operating income	22,741	25,712	45,403	41,742
Reconciling item
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net gain (loss) on sale of assets	1,525	(15)	1,588	5
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (16,937)	$ (14,828)	$ (30,772)	$ (28,805)