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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 item | Dec. 31, 2011 item | Dec. 31, 2010
Employee Benefit Plans |  |  |
Percentage of contribution of covered employee's salaries or wages | 2.50% |  |
Contribution | $ 5.2 | $ 5.1 | $ 4.3
Amount payable to plan | 0.1 | 0.1 |
Number of employees who are union members | 5 | 7 |
Period in which certain individuals are entitled to fixed annual payments | 15 years |  |
Portion of benefits vesting after ten years of completed service (as a percent) | 50.00% |  |
Period of completed service over which 50% of benefits are vested | 10 years |  |
Portion of benefits vesting after fifteen years of completed service (as a percent) | 75.00% |  |
Period of completed service over which 75% of benefits are vested | 15 years |  |
Period of service over which benefits are fully vested | 20 years |  |
Unfunded benefit liability | $ 3.0 | $ 2.8 |

X
- Definition Represents the period in which certain individuals are entitled to fixed annual payments. + References No definition available. + Details
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- Definition Represents the period of completed service over which 50 percent of benefits are vested. + References No definition available. + Details
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- Definition Represents the period of completed service over which 75 percent of benefits are vested. + References No definition available. + Details
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- Definition Represents the period of service over which benefits are fully vested. + References No definition available. + Details
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- Definition Represents the portion of benefits vesting after fifteen years of completed service. + References No definition available. + Details
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- Definition Represents the portion of benefits vesting after ten years of completed service. + References No definition available. + Details
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- Definition Represents the amount payable to defined contribution plan. + References No definition available. + Details
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X
- Definition Represents the number of employees who are union members and have participated in the multi-employer pension plans. + References No definition available. + Details
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- Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c -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 (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + 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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