CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 15,022	$ 14,379
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of product line	0	(810)
Depreciation and amortization	9,586	10,346
Deferred income taxes	2,722	(687)
Stock based compensation	1,187	1,040
Loss on disposition of property, plant and equipment	234	101
Changes in operating assets and liabilities:
Accounts receivable	(15,768)	(11,136)
Inventories	(6,950)	810
Accounts payable	4,635	5,678
Accrued payroll and other compensation	(1,253)	(16)
Accrued taxes	(1,247)	401
Other, net	2,740	(895)
Net cash provided by operating activities	10,908	19,211
Cash flows from investing activities:
Proceeds from maturity of short-term investment	0	12,015
Capital expenditures	(9,502)	(7,945)
Proceeds from sale of product line	0	1,000
Acquisition earn out payments	(158)	0
Net cash (used for) provided by investing activities	(9,660)	5,070
Cash flows from financing activities:
Debt repayments	(536)	(778)
Common stock issued	1,204	303
Common stock repurchased	(6,411)	(3,076)
Excess tax benefit on stock awards	197	0
Net cash used for financing activities	(5,546)	(3,551)
Effect of exchange rate changes on cash	671	(124)
(Decrease) increase in cash and cash equivalents	(3,627)	20,606
Cash and cash equivalents at beginning of period	63,623	30,905
Cash and cash equivalents at end of period	$ 59,996	$ 51,511