Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income before taxes
United States	$ (187,252)	$ 87,505	$ 67,355
Foreign	(14,580)	31,659	51,303
(Loss) income before income taxes	(201,832)	119,164	118,658
Current:
Federal	22,846	22,608	19,421
State	1,138	1,406	1,618
Foreign	3,103	12,326	11,864
Current income tax expense (benefit)	27,087	36,340	32,903
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	(25,707)	3,135	21
State and local	(619)	180	(364)
Foreign	1,923	(3,563)	(1,264)
Deferred income tax expense (benefit)	(24,403)	(248)	(1,607)
Income Tax Expense (Benefit), Continuing Operations	2,684	36,092	31,296
Effective Tax Rate Reconciliation
Income tax expense at U.S. federal statutory rate	(70,641)	41,708	41,530
State income taxes, net of federal tax benefit	361	841	757
Foreign income, net of credit on foreign taxes	12	(245)	501
Effective tax rate differential of earnings outside of U.S.	(46)	(5,411)	(8,257)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(5,658)
Change in valuation allowance		0	0
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	(860)	(1,150)	(2,105)
Non-deductible items	2,745	1,947	865
Change in uncertain tax positions	60	(52)	(347)
Domestic production activities deduction	(2,133)	(2,093)	(2,237)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	67,340	0	0
Other items	188	547	589
Deferred tax assets:
Accruals and reserves	23,363	23,197
Pensions	6,276	6,161
Inventory	6,768	5,176
Stock options	8,593	7,235
Tax credit carryforwards	1,046	553
Foreign net operating loss carryforwards	2,454	1,154
State net operating loss carryforward	1,922	1,331
Other - net	2,714	3,230
Total deferred tax assets before valuation allowance	53,136	48,037
Valuation allowance	(8,842)	(1,982)
Total deferred tax assets, net of valuation allowance	44,294	46,055
Deferred tax liabilities:
Property, plant and equipment	20,482	24,063
Intangibles	25,474	47,771
Deferred Tax Liabilities, Convertible Notes	1,586	2,118
Deferred Tax Liabilities, Gross, Noncurrent	47,542	73,952
Total deferred tax liabilities	3,248	27,897
Deferred Tax Assets, Net, Current	0	(17,248)
Deferred Tax Assets, Net, Noncurrent	(1,898)	(1,743)
Long-term deferred tax liabilities	5,146	46,888
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits Beginning Balance	948	941	3,339
Additions for tax positions of prior years	98	358	299
Reductions for tax positions of prior years	0	(329)	(1,921)
Lapse of statutes of limitation	(22)	(22)	(776)
Unrecognized Tax Benefits Ending Balance	1,024	948	941
Undistributed Earnings of Foreign Subsidiaries	190,681
Income Taxes Paid	30,492	31,208	24,977
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	504	462
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	121	94
Unrecognized Tax Benefits, Interest on Income Taxes Expense (Benefit)	27	$ (8)	$ 1
Possible future decreases in unrecognized tax benefits	$ 219