CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 21,504	$ 24,794
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,248	12,778
Long-lived asset impairment charge	0	772
Inventory step-up amortization	0	1,025
Deferred income taxes	1,165	157
Stock-based compensation	2,580	2,287
(Income) loss from equity method investment	(56)	68
Loss on disposition of property, plant and equipment	18	0
Changes in operating assets and liabilities:
Accounts receivable	(11,934)	(8,197)
Contract assets	(7,594)	0
Inventories	(15,643)	(14,202)
Accounts payable	7,406	15,479
Accrued payroll and other compensation	(2,408)	(729)
Accrued taxes	1,184	(977)
Other, net	(2,496)	(5,460)
Net cash provided by operating activities	7,974	27,795
Cash flows from investing activities:
Business acquisitions, net of cash acquired	0	(353)
Proceeds from the sale of property, plant and equipment	217	0
Capital expenditures	(16,355)	(15,068)
Net cash used for investing activities	(16,138)	(15,421)
Cash flows from financing activities:
Debt repayments	(126)	(21,566)
Common stock issued	666	313
Common stock repurchased	(823)	(2,497)
Net cash used for financing activities	(283)	(23,750)
Effect of exchange rate changes on cash	(815)	2,984
Decrease in cash and cash equivalents	(9,262)	(8,392)
Cash and cash equivalents at beginning of period	59,875	71,934
Cash and cash equivalents at end of period	$ 50,613	$ 63,542