Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income before taxes
United States	$ 67,355	$ 79,812	$ 42,429
Foreign	51,303	23,294	20,545
Income before income taxes	118,658	103,106	62,974
Current:
Federal	19,421	28,076	14,369
State	1,618	1,768	876
Foreign	11,864	5,456	5,976
Current income tax expense (benefit)	32,903	35,300	21,221
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	21	(3,477)	(962)
State and local	(364)	(684)	(66)
Foreign	(1,264)	(357)	(1,463)
Deferred income tax expense (benefit)	(1,607)	(4,518)	(2,491)
Income Tax Expense (Benefit), Continuing Operations	31,296	30,782	18,730
Reconciliation of income taxes
Income tax expense at U.S. federal statutory rate	41,530	36,087	22,041
State income taxes, net of federal tax benefit	757	711	810
Foreign income, net of credit on foreign taxes	501	48	137
Effective tax rate differential of earnings outside of U.S.	(8,257)	(4,983)	(1,901)
Foreign investment tax credit	0	(406)	(777)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	(2,105)	0	(350)
Non-deductible (taxable) items	865	2,885	424
Change in uncertain tax positions	(347)	(394)	(28)
Domestic production activities deduction	(2,237)	(2,490)	(1,626)
Other items	589	676	0
Deferred tax assets:
Accruals and reserves	25,478	27,625
Pensions	2,536	7,019
Inventory	4,350	2,775
Stock options	6,107	5,220
Tax credit carryforwards	0	2,662
Foreign net operating loss carryforwards	594	1,440
State net operating loss carryforward	1,610	1,517
Other - net	844	1,331
Total deferred tax assets before valuation allowance	41,519	49,589
Valuation allowance	(1,250)	(1,766)
Total deferred tax assets, net of valuation allowance	40,269	47,823
Deferred tax liabilities:
Property, plant and equipment	17,248	15,705
Intangibles	53,314	59,396
Deferred Tax Liabilities, Convertible Notes	2,623	3,071
Total deferred tax liabilities	73,185	78,172
Net deferred tax liabilities	32,916	30,349
Deferred Tax Assets, Net, Current	(14,675)	(15,282)
Deferred Tax Assets, Net, Noncurrent	(125)	(654)
Long-term deferred tax liabilities	47,716	46,285
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits Beginning Balance	3,339	2,440	2,468
Additions for tax positions of prior years	299	1,921	128
Reductions for tax positions of prior years	(1,921)	0	(22)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	905	0
Lapse of statutes of limitation	(776)	(117)	(134)
Unrecognized Tax Benefits Ending Balance	941	3,339	2,440
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	410	851
Undistributed Earnings of Foreign Subsidiaries	159,962
Income Taxes Paid	24,977	19,193	17,130
Accrual for interest and penalties	93		106
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	8	42	42
Possible future decreases in unrecognized tax benefits	$ 22