Condensed Consolidated Statement 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	$ 30,866	$ 24,850
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,125	5,969
Amortization	1,763	1,465
Equity in undistributed earnings of associated companies, net of dividends	(1,021)	(1,158)
Deferred compensation and other, net	(1,080)	1,332
Stock-based compensation	2,152	2,078
Gain on disposal of property, plant and equipment	(224)	(13)
Insurance settlement realized	(384)	(808)
Pension and other postretirement benefits	(1,884)	(1,951)
(Decrease) increase in cash from changes in current assets and current liabilities, net of acquisitions:
Accounts receivable	(9,913)	(7,031)
Inventories	(2,269)	(3,871)
Prepaid expenses and other current assets	(286)	(1,946)
Accounts payable and accrued liabilities	3,650	3,025
Net cash provided by operating activities	27,495	21,941
Cash flows from investing activities
Investments in property, plant and equipment	(5,202)	(6,423)
Payments related to acquisitions, net of cash acquired	(2,478)	0
Proceeds from disposition of assets	345	84
Insurance settlement received and interest earned	28	35
Change in restricted cash, net	356	773
Net cash used in investing activities	(6,951)	(5,531)
Cash flows from financing activities
Repayment of long-term debt	(7,563)	(1,754)
Dividends paid	(6,428)	(6,213)
Stock options exercised, other	84	(925)
Excess Tax Benefit Related to Stock Option Exercises, Cash Flow	452	1,420
Distributions to noncontrolling shareholders	0	(30)
Net cash used in financing activities	(13,455)	(7,502)
Effect of exchange rate changes on cash	(1,090)	(565)
Net increase in cash and cash equivalents	5,999	8,343
Cash and cash equivalents at beginning of period	32,547	16,909
Cash and cash equivalents at end of period	38,546	25,252
Other Noncash Investing And Financing Items [Abstract]
Accrued Property, Plant and Equipment Purchases	$ 1,159	$ 0