Business Acquisitions Business Acquisitions - Narrative (Details) - USD ($)				3 Months Ended		9 Months Ended
	Sep. 24, 2017	Oct. 13, 2016	Oct. 12, 2016	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Net income				$ 3,617,000	$ 4,418,000	$ 17,359,000	$ 12,103,000
Goodwill, Purchase Accounting Adjustments						1.5
Net revenues				159,693,000	134,833,000	456,131,000	432,023,000
Operating Income (Loss)				6,864,000	$ 3,513,000	25,622,000	14,355,000
Downstream [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 195,000,000
Business acquisition, net of cash acquired		$ 198,000,000
Business Combination, Contingent Consideration, Liability			15,000,000.0
Purchase price			216,457,000
Fair value of accounts receivables acquired			$ 28
Contingent Consideration Classified as Equity, Fair Value Disclosure				0		0		$ 12,200,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Instruments Classified in Shareholders' Equity, Period Increase (Decrease)						12,200,000
Net revenues				19,300,000		62,000,000
Operating Income (Loss)				$ 2,500,000		$ 17,200,000
Schroedahl [Member]
Business Acquisition [Line Items]
Acquisition-related costs							$ 200,000
Colfax, Inc. Fluid Handing Business [Member]
Business Combination, Purchase Agreement, Pending Acquisition [Abstract]
Purchase agreement, consideration to be transferred	$ 542.0
Purchase agreement, liabilities incurred	$ 150,000,000
Colfax, Inc. Fluid Handing Business [Member] | Common Stock [Member]
Business Combination, Purchase Agreement, Pending Acquisition [Abstract]
Purchase agreement, equity interests issuable (in shares)	3,283,424
Purchase agreement, share price of shares to be transferred (in dollars per share)	$ 0.01
Purchase agreement, equity interest issuable	$ 163,000,000