Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net earnings	$ 22,470	$ 19,240
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	5,231	4,806
Stock compensation expense	1,981	1,946
Shares issued under employee benefit plans	0	310
Deferred income tax expense	(783)	(828)
Foreign currency transaction loss	63	68
Changes in assets and liabilities
Accounts receivable	2,144	(2,784)
Inventories	(4,103)	(1,537)
Prepaid expenses and other current assets	1,065	515
Accounts payable and accrued expenses	(5,097)	2,632
Income taxes	848	6,753
Other	(35)	102
Net cash provided by operating activities	23,784	31,223
Cash flows from investing activities:
Capital expenditures	(5,171)	(3,198)
Intangible assets acquired	(216)	(10)
Net cash used in investing activities	(5,387)	(3,208)
Cash flows from financing activities:
Proceeds from long-term debt	0	178
Principal payments on long-term debt	0	(695)
Repayments of short-term obligations	(89)	0
Proceeds from stock options exercised	5,088	877
Excess tax benefits from stock compensation	3,164	1,182
Dividends paid	0	(5,237)
Purchase of treasury stock	(56)	(964)
Net cash provided by (used in) financing activities	8,107	(4,659)
Effect of exchange rate changes on cash	(21)	(77)
Increase in cash and cash equivalents	26,483	23,279
Cash and cash equivalents beginning of period	144,737	114,781
Cash and cash equivalents end of period	$ 171,220	$ 138,060