Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
OPERATING ACTIVITIES
Net Earnings	$ 46,614	$ 32,088	$ 50,651
Adjustments to Reconcile Net Earnings to Cash Provided by Operating Activities:
Depreciation	17,891	16,550	17,694
Amortization	409	1,481	2,369
Impairment of Long-Lived Assets	0	11,199	0
Deferred Income Taxes	(1,172)	(1,129)	129
Share-Based Compensation Expense	3,875	8,222	7,314
Allowance for Doubtful Accounts and Returns	468	1,089	1,504
Loss on Sale of Business	(149)	0	0
Other, Net	(345)	(100)	24
Changes in Operating Assets and Liabilities
Receivables, Net	(9,278)	4,547	(18,811)
Inventories	23	(10,190)	(21,155)
Accounts Payable	(3,904)	(10,455)	10,192
Employee Compensation and Benefits	124	716	1,927
Other Current Liabilities	(185)	(402)	2,782
Income Taxes	5,427	(4,283)	3,466
Other Assets and Liabilities	(2,218)	(4,101)	1,276
Net Cash Provided by Operating Activities	57,878	45,232	59,362
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(26,526)	(24,780)	(19,583)
Proceeds from Disposals of Property, Plant and Equipment	615	336	291
Acquisition of Businesses, Net of Cash Acquired	(12,933)	0	0
Issuance of Long-Term Note Receivable	(2,000)	0	0
Proceeds from Sale of Business	285	1,185	1,416
Decrease (Increase) in Restricted Cash	116	(322)	6
Net Cash Used for Investing Activities	(40,443)	(23,581)	(17,870)
FINANCING ACTIVITIES
Payments of Short-term Debt	0	0	(1,500)
Payments of Long-Term Debt	(3,460)	(3,445)	(2,016)
Proceeds from Issuance of Long-term Debt	15,000	0	0
Purchases of Common Stock	(12,762)	(45,998)	(14,097)
Proceeds from Issuances of Common Stock	5,271	1,677	2,269
Excess Tax Benefit on Stock Plans	686	859	1,793
Dividends Paid	(14,293)	(14,498)	(14,487)
Net Cash Used for Financing Activities	(9,558)	(61,405)	(28,038)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(1,144)	(1,908)	(1,476)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	6,733	(41,662)	11,978
Cash and Cash Equivalents at Beginning of Year	51,300	92,962	80,984
CASH AND CASH EQUIVALENTS AT END OF YEAR	58,033	51,300	92,962
Cash Paid During the Year for:
Income Taxes	14,172	23,421	11,342
Interest	1,135	1,167	1,470
Supplemental Non-Cash Investing and Financing Activities:
Long-Term Note Receivable from Sale of Business	5,489	0	0
Capital Expenditures in Accounts Payable	$ 2,045	$ 1,830	$ 1,197