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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |
Net increase (decrease) in deferred tax asset valuation allowance | $ (6,300) | $ 28,600 |
Aggregate tax loss carryforward | 8,500 |  |
Valuation allowance of deferred tax assets | 113,237 | 119,494 |
Deferred tax assets related to U.S. federal tax carryforwards | 46,600 | 48,600 |
Deferred tax assets related to U.S. state tax carryforwards | 11,100 | 12,500 |
Deferred tax assets related to foreign tax carryforwards | 47,700 | 49,900 |
Net benefit related to increase in unrecognized tax benefits | 1,700 |  |
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 | 600 | 700 | 600
Unrecognized tax benefits that would impact effective tax rate | 4,500 | 6,200 | $ 4,800
Valuation Allowance Related To Income Tax Expense |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net increase (decrease) in deferred tax asset valuation allowance | 5,300 | 24,400 |
Impact of Unrecorded Tax Attributes Related to Changes in Cumulative Translation Adjustments |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net increase (decrease) in deferred tax asset valuation allowance | $ 1,000 | $ 4,200 |

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