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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Obligation for transition tax liability, net of tax credits | $ 17,100 | $ 17,100 |  |
Net increase (decrease) in deferred tax asset valuation allowance |  | 28,600 | $ 34,300 |
Deferred tax expense to reflect the reduced tax rate and related effects | 600 |  |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Valuation Allowance, Provisional Income Tax Expense | 100 |  |  |
Net tax expense not offset by change in valuation allowance | 700 |  |  |
Valuation allowance of deferred tax assets | 119,494 | 119,494 | 90,900 |
Net expense related to increase in unrecognized tax benefits |  | 1,500 |  |
Income tax penalties and interest |  | 200 | 200 | $ 200
Interest from settlements, lapse of statutes, and change in certainty released |  | 200 |  |
Cumulative accrued balance of penalties and interest | 700 | 700 | 600 | 500
Unrecognized tax benefits that would impact effective tax rate | 6,200 | 6,200 | 4,800 | $ 5,000
Deferred tax assets related to U.S. federal tax carryforwards | 48,600 | 48,600 | 57,300 |
Deferred tax assets related to U.S. state tax carryforwards | 12,500 | 12,500 | 9,400 |
Deferred tax assets related to foreign tax carryforwards | 49,500 | 49,500 | 39,300 |
European, South American and Asian jurisdictions [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Aggregate tax loss carryforward | $ 18,800 | 18,800 |  |
Valuation Allowance Related To Income Tax Expense [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net increase (decrease) in deferred tax asset valuation allowance |  | 24,400 | 16,000 |
Valuation Allowance, Impact of Unrecorded Tax Attributes Related to Changes in Cumulative Translation Adjustments [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net increase (decrease) in deferred tax asset valuation allowance |  | $ 4,200 | $ 18,300 |

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