Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Domestic	$ 66,600,000	$ 56,900,000	$ 47,000,000
Foreign	57,100,000	53,700,000	54,500,000
Income from continuing operations before provision for taxes on income	123,710,000	110,645,000	101,461,000
Domestic [Abstract]
Taxes currently payable, Federal	13,700,000	14,900,000	11,800,000
Taxes currently payable, State and local	2,600,000	1,300,000	2,200,000
Deferred income taxes	2,500,000	3,200,000	(1,900,000)
Domestic tax provision (benefit)	18,800,000	19,400,000	12,100,000
Foreign [Abstract]
Taxes currently payable	13,800,000	14,300,000	13,100,000
Deferred income taxes	1,900,000	(1,800,000)	3,500,000
Foreign tax provision	15,700,000	12,500,000	16,600,000
Total tax provision (benefit)	34,515,000	31,926,000	28,675,000
Reconciliation of U. S. federal statutory tax rate to effective tax rate [Abstract]
U.S. statutory tax rate (in hundredths)	35.00%	35.00%	35.00%
Depletion (in hundredths)	(3.60%)	(3.80%)	(4.00%)
Difference between tax provided on foreign earnings (in hundredths)	(3.60%)	(4.00%)	(1.00%)
State and local taxes, net of Federal tax benefit (in hundredths)	1.70%	1.50%	1.20%
Tax credits and foreign dividends (in hundredths)	(1.70%)	(0.10%)	(0.10%)
Change in valuation allowance (in hundredths)	0.30%	(1.10%)	(1.20%)
Impact of uncertain tax positions (in hundredths)	(0.60%)	0.90%	(2.70%)
Impact of officer's non-deductible compensation	2.30%	2.10%	2.90%
Other (in hundredths)	(1.90%)	(1.60%)	(1.80%)
Consolidated effective tax rate (in hundredths)	27.90%	28.90%	28.30%
Deferred tax assets [Abstract]
Accrued expenses	9,400,000	12,200,000
Net operating loss carry forwards	9,600,000	11,400,000
Pension and post-retirement benefits costs	21,600,000	43,800,000
Other	14,300,000	12,900,000
Valuation allowance	(5,900,000)	(5,700,000)
Total deferred tax assets	49,000,000	74,600,000
Deferred tax liabilities [Abstract]
Plant and equipment, principally due to differences in depreciation	14,300,000	10,300,000
Intangible assets	13,300,000	12,400,000
Other	1,600,000	4,400,000
Total deferred tax liabilities	29,200,000	27,100,000
Net deferred tax (assets) liabilities	19,800,000	47,500,000
Net deferred tax assets, current	4,000,000	6,300,000
Net deferred assets, long term	15,800,000	41,200,000
Operating Loss Carryforwards [Line Items]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	4,800,000
Expiration period (in years)	20 years
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits that would impact effective tax rate	2,500,000
Unrecognized tax benefits [Roll forward]
Balance as of beginning of year	4,800,000	3,900,000
Increases related to current year positions	600,000	700,000
Increases related to new judgments	0	200,000
Decreases related to audit settlements and statute expirations	(1,500,000)	0
Other	0	0
Balance as of end of year	3,900,000	4,800,000	3,900,000
Unrecognized tax benefits, net reversal of accrued interest and penalties	400,000
Unrecognized tax benefits, accrued interest and penalties	600,000
Cash paid for income taxes [Abstract]
Net cash paid for income taxes	25,500,000	21,500,000	31,900,000
Undistributed earnings of foreign subsidiaries [Abstract]
Foreign subsidiaries' undistributed earnings for which the company has not provided for withholding taxes	334,800,000
Estimated incremental taxes that may be incurred on foreign subsidiaries' undistributed earnings were the earnings to be repatriated	46,000,000
Indefinite lived tax loss carry forwards [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	2,500,000
Finite lived tax loss carry forwards [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	$ 2,300,000