Consoldiated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES
Net Earnings	$ 41,584	$ 32,713	$ 34,803
Adjustments to Reconcile Net Earnings to Cash Provided by Operating Activities:
Depreciation	18,072	18,088	18,026
Amortization	2,800	3,330	3,166
Impairment of Intangible Assets	0	2,058	0
Deferred Income Taxes	3,166	(1,352)	(11,412)
Share-Based Compensation Expense	9,092	5,407	4,639
Allowance for Doubtful Accounts and Returns	1,427	1,879	1,403
Gain on Sale of Business	(784)	0	0
Other, Net	(126)	508	503
Changes in Operating Assets and Liabilities, Exluding the Impact of Acquisitions:
Accounts Receivable	(11,811)	(4,451)	(7,931)
Inventories	(149)	(7,665)	(4,391)
Accounts Payable	970	4,612	(1,445)
Employee Compensation and Benefits	(3,005)	1,177	1,162
Other Current Liabilities	1,549	1,711	6,058
Income Taxes	797	1,668	(1,716)
U.S. Pension Plan Contributions	(16,731)	0	0
Other Assets and Liabilities	715	(2,774)	(335)
Net Cash Provided by Operating Activities	47,566	56,909	42,530
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(15,623)	(13,902)	(10,529)
Proceeds form Disposals of Property, Plant and Equipment	1,028	601	595
Acquisition of Businesses, Net of Cash Acquired	(750)	(2,917)	(86)
Proceeds from Sale of Business	1,014	0	0
Decrease (Increase) in Restricted Cash	3,089	(3,279)	0
Net Cash Used for Investing Activities	(11,242)	(19,497)	(10,020)
FINANCING ACTIVITIES
Change in Short-Term Borrowings, Net	0	0	(7)
Payments of Long-Term Debt	(2,986)	(19,272)	(4,192)
Issuance of Long-Term Debt	0	20,000	0
Purchases of Common Stock	(25,343)	(17,603)	(3,153)
Proceeds from Issuance of Common Stock	4,167	4,214	6,467
Tax Benefit on Stock Plans	2,047	1,266	1,724
Dividends Paid	(12,817)	(12,852)	(11,181)
Net Cash Used for Financing Activities	(34,932)	(24,247)	(10,342)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	209	(355)	(701)
NET INCREASE IN CASH AND CASH EQUIVALENTS	1,601	12,810	21,467
Cash and Cash Equivalents at Beginning of Year	52,339	39,529	18,062
CASH AND CASH EQUIVALENTS AT END OF YEAR	53,940	52,339	39,529
Cash Paid During the Year for:
Income Taxes	11,563	13,158	13,908
Interest	2,375	2,059	1,559
Supplemental Non-Cash Investing and Financing Activities:
Capital Expenditures Funded Through Capital Leases	1,526	2,893	2,398
Capital Expenditures in Accounts Payable	1,582	2,669	689
Collateralized Borrowings	39	127	471
Notes Payable Related to Water Star, Inc. Acquisition	$ 0	$ 1,500	$ 0