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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 |  |

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of interest expense for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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