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Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Employee Benefit Plans |  |  |  |
Base contribution as a percentage of employee gross pay (as a percent) | 2.00% |  |  |
Employer maximum match of an employee's contributions of first 4% of eligible compensation (as a percent) | 100.00% |  |  |
Percentage of eligible compensation, matched 100% by employer | 4.00% |  |  |
Company's matching contributions under certain 401(k) savings plans | $ 4.0 | $ 0.5 | $ 0.5 | $ 0.5
Employee Benefit Plans |  |  |  |
Charges for pension plans |  | 8.3 | 6.9 |
Supplemental compensation agreement with Timothy P. Horne |  |  |  |
Supplemental compensation paid on an annual basis | 0.6 | 0.5 | 0.5 |
Minimum |  |  |  |
Supplemental compensation agreement with Timothy P. Horne |  |  |  |
Hours per year required to be worked as a consultant in return for certain annual compensation | 300 hours |  |  |
Maximum |  |  |  |
Supplemental compensation agreement with Timothy P. Horne |  |  |  |
Hours per year required to be worked as a consultant in return for certain annual compensation | 500 hours |  |  |
European pension plans |  |  |  |
Employee Benefit Plans |  |  |  |
Charges for pension plans | $ 6.0 | $ 6.2 | $ 3.5 |

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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- Definition Represents the employer maximum matching contribution of the first level of an employee's contributions. + References No definition available. + Details
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- Definition The compensation expense paid during the period pertaining to the supplemental compensation agreement. + References No definition available. + Details
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