Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net earnings	$ 10,888	$ 9,268
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	2,621	2,420
Stock compensation expense	1,076	974
Shares issued under employee benefit plans	0	197
Deferred income tax expense	(623)	(354)
Foreign currency transaction loss (gain)	48	(59)
Changes in assets and liabilities
Accounts receivable	(3,983)	(3,249)
Inventories	(3,260)	(1,315)
Prepaid expenses and other current assets	782	290
Accounts payable and accrued expenses	(3,715)	(362)
Income taxes	550	4,776
Other	(31)	69
Net cash provided by operating activities	4,353	12,655
Cash flows from investing activities:
Capital expenditures	(3,400)	(1,401)
Intangible assets acquired	(33)	0
Net cash used in investing activities	(3,433)	(1,401)
Cash flows from financing activities:
Proceeds from long-term debt	0	178
Principal payments on long-term debt	0	(351)
Repayments of short-term obligations	(89)	0
Proceeds from stock options exercised	2,097	504
Excess tax benefits from stock compensation	1,491	1,086
Dividends paid	0	(5,237)
Purchase of treasury stock	(27)	(964)
Net cash provided by (used in) financing activities	3,472	(4,784)
Effect of exchange rate changes on cash	(39)	40
Increase in cash and cash equivalents	4,353	6,510
Cash and cash equivalents beginning of period	144,737	114,781
Cash and cash equivalents end of period	$ 149,090	$ 121,291