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Income Taxes (Details 2) (USD $) |  |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 UK | Dec. 31, 2013 German | Dec. 31, 2013 Italian | Dec. 31, 2013 State | Dec. 31, 2013 Federal and state | Dec. 31, 2013 Federal
Operating loss carryforwards |  |  |  |  |  |  |  |
Net operating loss carryforwards that expire at various dates |  |  |  |  |  | $ 160,300,000 |  |
Amount of tax credit carryforwards |  |  |  |  |  | 5,500,000 | 2,400,000 |
Net operating loss carryforwards not subject to expiration |  |  | 300,000 | 11,600,000 | 400,000 |  |  |
Net operating loss carryforwards utilized |  |  |  |  |  | 48,000,000 |  | 39,100,000
Valuation allowance against net operating loss carryforwards |  |  |  | 3,600,000 |  | 3,100,000 |  |
Valuation allowance against state credit carryforwards |  |  |  |  |  | 29,000 |  |
Valuation allowance against deferred tax assets related to buildings | $ 14,600,000 | $ 14,600,000 | $ 7,900,000 |  |  |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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