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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income before taxes      
United States $ 40,471 $ (187,252) $ 87,505
Foreign (2,072) (14,580) 31,659
Income (loss) before income taxes 38,399 (201,832) 119,164
Current:      
Federal 9,977 22,846 22,608
State 1,009 1,138 1,406
Foreign 5,299 3,103 12,326
Current income tax expense (benefit) 16,285 27,087 36,340
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal (3,334) (25,707) 3,135
State and local (206) (619) 180
Foreign 957 1,923 (3,563)
Deferred income tax expense (benefit) (2,583) (24,403) (248)
Income Tax Expense (Benefit), Continuing Operations 13,702 2,684 36,092
Effective Tax Rate Reconciliation      
Income tax expense at U.S. statutory rate 13,440 (70,641) 41,708
State income taxes, net of federal tax benefit 694 361 841
Foreign income, net of credit on foreign taxes 164 12 (245)
Effective tax rate differential of earnings outside of U.S. 513 (46) (5,411)
Change in valuation allowance 6,581 5,658 0
Research & experimentation credits (896) (860) (1,150)
Non-deductible items 756 2,745 1,947
Change in uncertain tax positions (158) 60 (52)
Domestic production activities deduction (1,236) (2,133) (2,093)
Tax effect of asset impairments 0 67,340 0
Effective Income Tax Rate Reconciliation, Insurance Proceeds (5,845) 0 0
Other items (311) 188 547
Deferred tax assets:      
Accruals and reserves 24,076 23,363  
Pensions 5,298 6,276  
Inventory 6,835 6,768  
Stock options 9,347 8,593  
Tax credit carryforwards 2,179 1,046  
Foreign net operating loss carryforwards 5,903 2,454  
State net operating loss carryforward 1,646 1,922  
Other - net 889 2,714  
Total deferred tax assets before valuation allowance 56,173 53,136  
Valuation allowance (15,051) (8,842)  
Total deferred tax assets, net of valuation allowance 41,122 44,294  
Deferred tax liabilities:      
Property, plant and equipment 19,446 20,482  
Intangibles 22,894 25,474  
Deferred Tax Liabilities, Convertible Notes 1,023 1,586  
Deferred Tax Liabilities, Gross, Noncurrent 43,363 47,542  
Total deferred tax liabilities 2,241 3,248  
Deferred Tax Assets, Net, Noncurrent (2,000) (1,898)  
Long-term deferred tax liabilities 4,241 5,146  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits Beginning Balance 1,024 948 941
Additions for tax positions of prior years 0 98 358
Reductions for tax positions of prior years (17) 0 (329)
Lapse of statutes of limitation (219) (22) (22)
Unrecognized Tax Benefits Ending Balance 788 1,024 948
Undistributed Earnings of Foreign Subsidiaries 190,419    
Income Taxes Paid 17,576 30,492 31,208
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 579 714  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 86 $ 121  
Unrecognized Tax Benefits, Interest on Income Taxes Expense (Benefit) 21   $ 27
Possible future decreases in unrecognized tax benefits $ 77