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Income Taxes (Narrative) (Details) € in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 28, 2012 EUR (€) | Dec. 31, 2013 EUR (€) | Jan. 31, 2012 EUR (€) | Jun. 28, 2014 EUR (€) | Sep. 29, 2012 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Percentage of earnings from continuing operations before income taxes attributable to the United States |  |  |  |  |  | 57.00% |  |
TCJA revaluation of deferred tax assets and liabilities |  |  |  |  |  | $ 106,107 |  |
Belgium tax reform revaluation of deferred tax assets and liabilities |  |  |  |  |  | 44,439 |  |
Valuation allowance against deferred tax asset |  |  |  |  |  | 362,963 | $ 289,078 |
Increase (decrease) in the valuation allowance |  |  |  |  |  | 73,885 | 1,498 |
Net operating loss carryforwards and tax credit |  |  |  |  |  | 530,978 | 456,130 |
Net operating loss carryforwards in various foreign jurisdictions |  |  |  |  |  | 455,161 |  |
Repatriation transition tax expense |  |  |  |  |  | 105,165 |  |
Accumulated earnings |  |  |  |  |  | 860,000 |  |
TCJA net provisional tax expense |  |  |  |  |  | 45,249 |  |
Related transactions for repatriation transition tax expense |  |  |  |  |  | 46,191 |  |
Gross unrecognized tax benefits |  |  |  |  |  | 65,631 | 46,434 | $ 51,037
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  |  | 52,433 |  |
Interest and penalties |  |  |  |  |  | 8,252 | 8,020 |
Accrued/(reversed) interest and penalties |  |  |  |  |  | 165 | $ 2,170 | $ (5,635)
Expected decrease in unrecognized tax benefits within next twelve months |  |  |  |  |  | $ 13,248 |  |
Domestic tax authority |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  | 43.10% | 38.50% | 39.80%
Foreign tax authority |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  | 3.20% | 10.80% | 0.70%
Foreign tax authority | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Interest income related to interest tax examination refund | € |  |  |  |  | € 1,583 |  |  |
Foreign tax authority | Tax year 2008 | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign tax assessment | € |  |  | € 23,789 | € 30,131 |  |  |  |
Foreign tax authority | Tax year 2005 | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign tax assessment | € | € 46,135 |  |  |  |  |  |  |
Foreign tax authority | Tax year 2009 | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign tax assessment | € | € 35,567 |  |  |  |  |  |  |
Foreign tax authority | Tax year 2006 | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign tax assessment | € |  | € 38,817 |  |  |  |  |  |
Foreign tax authority | Tax year 2007 | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign tax assessment | € |  | 39,635 |  |  |  |  |  |
Foreign tax authority | Tax year 2010 | Belgium |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign tax assessment | € |  | € 43,117 |  |  |  |  |  |
State |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards and tax credit |  |  |  |  |  | $ 74,985 |  |
Foreign subsidiary and state net operating losses and tax credits |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in the valuation allowance |  |  |  |  |  | 36,792 | $ (9,364) |
State deferred tax assets |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance against deferred tax asset |  |  |  |  |  | 33,503 |  |
Operating loss carryforward, foreign jurisdiction |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance against deferred tax asset |  |  |  |  |  | $ 329,301 |  |

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