Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Goodwill, Purchase Accounting Adjustments	$ 1,467	$ 0
Capital Expenditures Incurred but Not yet Paid	500	1,000
OPERATING ACTIVITIES
Net income	4,773	3,872
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,798	3,263
Amortization	3,092	2,529
Bad debt recovery	(54)	(848)
Loss on write down of inventory	548	2,525
Compensation expense of share-based plans	738	1,538
Tax effect of share-based plan compensation	0	92
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(2,500)	0
(Gain) Loss on sale or write down of property, plant and equipment	(110)	1,503
Changes in operating assets and liabilities, net of effects of acquisition:
Trade accounts receivable	14,018	11,089
Inventories	2,030	8,486
Prepaid expenses and other assets	(4,297)	(4,287)
Accounts payable, accrued expenses and other liabilities	(5,841)	(22,108)
Net cash provided by operating activities	16,195	7,654
INVESTING ACTIVITIES
Purchases of property, plant and equipment	(3,001)	(4,021)
Proceeds from the sale of property, plant and equipment	190	87
Net cash used in investing activities	(1,344)	(3,934)
FINANCING ACTIVITIES
Proceeds from long-term debt	34,900	35,139
Payments of long-term debt	(43,100)	(27,871)
Dividends paid	(624)	(625)
Proceeds from the exercise of stock options	295	111
Tax effect of share-based plan compensation	0	(92)
Net cash (used in) provided by financing activities	(8,529)	6,662
Effect of exchange rate changes on cash and cash equivalents	1,055	1,657
INCREASE IN CASH AND CASH EQUIVALENTS	7,377	12,039
Cash and cash equivalents at beginning of period	58,279	54,541
CASH AND CASH EQUIVALENTS AT END OF PERIOD	65,656	66,580
Energy Segment [Member]
INVESTING ACTIVITIES
Purchases of property, plant and equipment	$ (791)	$ (922)