Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Balance	$ 502,553
Net income	13,316	$ 12,239
Compensation and benefits paid or payable in shares	864
Options exercised	271
Dividends declared	(5,454)
Cumulative translation adjustments	13,111
Pension and postretirement liability adjustments	(362)
Derivative valuation adjustment	(1,594)
Balance	522,705
Common Stock [Member]
Balance	$ 40
Net income
Compensation and benefits paid or payable in shares
Options exercised
Dividends declared
Cumulative translation adjustments
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	$ 40
Additional Paid-in Capital [Member]
Balance	$ 423,108
Net income
Compensation and benefits paid or payable in shares	$ 864
Options exercised	$ 271
Dividends declared
Cumulative translation adjustments
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	$ 424,243
Retained Earnings [Member]
Balance	491,950
Net income	$ 13,501
Compensation and benefits paid or payable in shares
Options exercised
Dividends declared	$ (5,454)
Cumulative translation adjustments
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	$ 499,997
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	$ (158,844)
Net income
Compensation and benefits paid or payable in shares
Options exercised
Dividends declared
Cumulative translation adjustments	$ 13,114
Pension and postretirement liability adjustments	(362)
Derivative valuation adjustment	(1,594)
Balance	(147,686)
Treasury Stock [Member]
Balance	$ (257,391)
Net income
Compensation and benefits paid or payable in shares
Options exercised
Dividends declared
Cumulative translation adjustments
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	$ (257,391)
Noncontrolling Interest [Member]
Balance	3,690
Net income	$ (185)
Compensation and benefits paid or payable in shares
Options exercised
Dividends declared
Cumulative translation adjustments	$ (3)
Pension and postretirement liability adjustments
Derivative valuation adjustment
Balance	$ 3,502