CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 11,054	$ 11,669
Adjustments to reconcile net income to net cash (used for) provided by operating activities:
Depreciation and amortization	7,220	6,517
Long-lived asset impairment charge	0	772
Inventory step-up amortization	0	481
Deferred income taxes	601	185
Stock-based compensation	1,201	1,231
Loss from equity method investment	4	46
Changes in operating assets and liabilities:
Accounts receivable	(18,626)	(7,780)
Contract assets	(5,745)	0
Inventories	(8,796)	(12,015)
Accounts payable	9,471	13,686
Accrued payroll and other compensation	(2,432)	(1,154)
Accrued taxes	877	574
Other, net	1,209	(1,854)
Net cash (used for) provided by operating activities	(3,962)	12,358
Cash flows from investing activities:
Capital expenditures	(7,676)	(9,560)
Net cash used for investing activities	(7,676)	(9,560)
Cash flows from financing activities:
Debt repayments	(57)	(10,467)
Common stock issued	666	155
Common stock repurchased	(823)	(2,497)
Net cash used for financing activities	(214)	(12,809)
Effect of exchange rate changes on cash	1,080	616
Decrease in cash and cash equivalents	(10,772)	(9,395)
Cash and cash equivalents at beginning of period	59,875	71,934
Cash and cash equivalents at end of period	$ 49,103	$ 62,539