Condensed Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net Income	$ 44,171	$ 36,473
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	9,219	9,001
Amortization	2,621	2,283
Equity in undistributed earnings of associated companies, net of dividends	(2,525)	(1,854)
Deferred compensation and other, net	(50)	1,848
Stock-based compensation	3,133	2,954
Loss (Gain) on disposal of property, plant and equipment	193	(75)
Insurance settlement realized	(731)	(1,074)
Pension and other postretirement benefits	(561)	(1,823)
(Decrease) increase in cash from changes in current assets and current liabilities, net of acquisitions:
Accounts receivable	(13,222)	(1,381)
Inventories	(4,569)	(875)
Prepaid expenses and other current assets	1,017	(1,976)
Accounts payable and accrued liabilities	13,256	(1,731)
Net cash provided by operating activities	51,952	41,770
Cash flows from investing activities
Investments in property, plant and equipment	(7,330)	(8,757)
Payments related to acquisitions, net of cash acquired	(2,478)	(2,635)
Proceeds from disposition of assets	391	193
Insurance settlement received and interest earned	40	53
Change in restricted cash, net	691	1,021
Net cash used in investing activities	(8,686)	(10,125)
Cash flows from financing activities
Repayment of long-term debt	(12,289)	(9,672)
Dividends paid	(9,721)	(9,410)
Stock options exercised, other	(510)	(828)
Excess Tax Benefit Related to Stock Option Exercises, Cash Flow	815	2,164
Distributions to noncontrolling shareholders	(30)	(30)
Net cash used in financing activities	(21,735)	(17,776)
Effect of exchange rate changes on cash	(133)	(606)
Net increase in cash and cash equivalents	21,398	13,263
Cash and cash equivalents at beginning of period	32,547	16,909
Cash and cash equivalents at end of period	53,945	30,172
Other Noncash Investing And Financing Items [Abstract]
Accrued Property, Plant and Equipment Purchases	$ 1,178	$ 0