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Changes in Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Balance	$ 513,568
Compensation and benefits paid or payable in shares	575
Options exercised	946
Net income	12,239us-gaap_ProfitLoss	10,693us-gaap_ProfitLoss
Dividends declared	(5,080)us-gaap_Dividends
Cumulative translation adjustment	(37,412)
Pension and postretirement liability adjustments	1,987
Derivative valuation adjustment	(379)
Balance	486,444
Common Stock [Member]
Balance	40
Compensation and benefits paid or payable in shares
Options exercised
Net income
Dividends declared
Cumulative translation adjustment
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	40
Additional Paid-in Capital [Member]
Balance	418,972
Compensation and benefits paid or payable in shares	575
Options exercised	946
Net income
Dividends declared
Cumulative translation adjustment
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	420,493
Retained Earnings [Member]
Balance	456,105
Compensation and benefits paid or payable in shares
Options exercised
Net income	12,213
Dividends declared	(5,080)
Cumulative translation adjustment
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	463,238
Accumulated Items of Other Comprehensive Income [Member]
Balance	(107,767)
Compensation and benefits paid or payable in shares
Options exercised
Net income
Dividends declared
Cumulative translation adjustment	(37,413)
Pension and postretirement liability adjustments	1,987
Derivative valuation adjustment	(379)
Balance	(143,572)
Treasury Stock [Member]
Balance	(257,481)
Compensation and benefits paid or payable in shares
Options exercised
Net income
Dividends declared
Cumulative translation adjustment
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	(257,481)
Noncontrolling Interest [Member]
Balance	3,699
Compensation and benefits paid or payable in shares
Options exercised
Net income	26
Dividends declared
Cumulative translation adjustment	1
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	$ 3,726