CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 27,760	$ 35,469
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,442	19,386
Long-lived asset impairment charge	0	772
Inventory step-up amortization	1,390	1,108
Deferred income taxes	340	(466)
Stock-based compensation	3,187	3,240
(Income) loss from equity method investment	(120)	37
Loss on disposition of property, plant and equipment	100	0
Changes in operating assets and liabilities:
Accounts receivable	(25,407)	(12,138)
Contract assets	(5,443)	0
Inventories	(12,160)	(11,795)
Accounts payable	8,296	18,071
Accrued payroll and other compensation	(1,406)	2,044
Accrued taxes	981	(2,826)
Benefit plan liabilities	(7,635)	(3,797)
Other, net	2,173	(2,913)
Net cash provided by operating activities	14,498	46,192
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(269,972)	(335)
Capital expenditures	(20,091)	(19,918)
Proceeds from the sale of property, plant and equipment	282	0
Net cash used for investing activities	(289,781)	(20,253)
Cash flows from financing activities:
Proceeds from borrowings	338,000	0
Debt repayments	(76,794)	(35,674)
Debt issuance cost payments	(538)	0
Common stock issued	846	409
Common stock repurchased	(956)	(2,592)
Net cash provided by (used for) financing activities	260,558	(37,857)
Effect of exchange rate changes on cash	(1,076)	4,690
Decrease in cash and cash equivalents	(15,801)	(7,228)
Cash and cash equivalents at beginning of period	59,875	71,934
Cash and cash equivalents at end of period	$ 44,074	$ 64,706