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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes | $ 971 | $ 3,723 | $ 2,067 | $ 1,041 | $ (1,212) | $ (2,214) | $ 1,700 | $ 1,179 | $ 29,535 | $ (3,524) | $ (10,096) | $ (6,943) |  | $ 7,802 | $ (547) | $ 8,972
Tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Tax expense from revalue of deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,889 |  |
Income tax expense related to transition tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,474 |  |
Net tax expense related to transition tax and revaluation of deferred tax balances |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,362 |  |
Difference between effective tax rate and federal statutory rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.60% | 36.40%
Valuation allowance | 80,796 |  |  |  | 109,913 |  |  |  |  |  |  |  |  | 80,796 | $ 109,913 |
Deferred income tax assets | 35,004 |  |  |  | 29,398 |  |  |  |  |  |  |  |  | 35,004 | 29,398 |
Net operating loss carryforwards | 237,186 |  |  |  | 148,199 |  |  |  |  |  |  |  |  | 237,186 | 148,199 |
Loss carryforwards for U.S. federal income tax purposes | 115,846 |  |  |  | 50,587 |  |  |  |  |  |  |  |  | 115,846 | 50,587 |
Loss carryforwards for U.S. state income tax purposes | 101,563 |  |  |  | 78,274 |  |  |  |  |  |  |  |  | 101,563 | 78,274 |
Loss carryforwards for foreign income tax purposes | 19,777 |  |  |  | 19,338 |  |  |  |  |  |  |  |  | 19,777 | 19,338 |
Unrecognized benefits |  |  |  |  |  |  |  |  |  |  |  |  |  | 218 | 10,077 |
Anticipated additional unrecognized tax benefits during the next twelve months |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  |  |
Australia Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 |  |
Belgium Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2014 |  |
Brazil Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
China Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2014 |  |
France Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2014 |  |
German Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 |  |
India Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 |  |
Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 |  |
Italy Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
Japan Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
Korea Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
Mexican Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
Netherlands Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
Switzerland Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
United Kingdom Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2016 |  |
Uruguay Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012 |  |
Minimum [Member] | U.S. Internal Revenue Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2003 |  |
Maximum [Member] | U.S. Internal Revenue Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2017 |  |
U.S Federal Income Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference in effective rate due to Tax Act |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.60% |  |
Research and experimentation tax credit carryforwards | 2,845 |  |  |  | 2,544 |  |  |  |  |  |  |  |  | $ 2,845 | 2,544 |
Foreign tax credits | 3,549 |  |  |  | 7,155 |  |  |  |  |  |  |  |  | 3,549 | 7,155 |
Other tax credits | 474 |  |  |  |  |  |  |  |  |  |  |  |  | $ 474 |  |
U.S Federal Income Tax [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards beginning expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2022 |  |
U.S. State Income Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and experimentation tax credit carryforwards | 3,745 |  |  |  | 2,649 |  |  |  |  |  |  |  |  | $ 3,745 | 2,649 |
Tax credit carryforwards beginning expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2017 |  |
U.S. State Income Tax [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards beginning expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2017 |  |
Foreign Income Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and experimentation tax credit carryforwards | 170 |  |  |  | 149 |  |  |  |  |  |  |  |  | $ 170 | 149 |
Foreign Income Tax [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards beginning expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |
Other State Income Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other tax credits | $ 600 |  |  |  | $ 600 |  |  |  |  |  |  |  |  | $ 600 | $ 600 |
Tax credit carryforwards beginning expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2024 |  |

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