CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 10,447	$ 10,504
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of product line	0	(810)
Depreciation and amortization	6,541	6,989
Deferred income taxes	1,477	(467)
Stock based compensation	712	846
Loss on disposition of property, plant and equipment	182	17
Changes in operating assets and liabilities:
Accounts receivable	(9,809)	(9,428)
Inventories	(6,538)	215
Accounts payable	1,565	4,041
Accrued payroll and other compensation	192	935
Accrued taxes	(41)	549
Other, net	1,752	(864)
Net cash provided by operating activities	6,480	12,527
Cash flows from investing activities:
Proceeds from maturity of short-term investment	0	12,015
Capital expenditures	(5,515)	(5,785)
Acquisition earn out payments	(158)	0
Net cash (used for) provided by investing activities	(5,673)	6,230
Cash flows from financing activities:
Debt repayments	(375)	(573)
Common stock issued	912	203
Common stock repurchased	(6,194)	(2,712)
Excess tax benefit on stock awards	146	0
Net cash used for financing activities	(5,511)	(3,082)
Effect of exchange rate changes on cash	(377)	(525)
(Decrease) increase in cash and cash equivalents	(5,081)	15,150
Cash and cash equivalents at beginning of period	63,623	30,905
Cash and cash equivalents at end of period	$ 58,542	$ 46,055