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Retirement and Benefit Plans Level 4 Postretirement Benefit Plans (Details) (USD $) | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2012 | Dec. 31, 2012 employee | Dec. 31, 2012 employee | Dec. 31, 2011 | Dec. 31, 2010
Retirement and Benefit Plans [Abstract] |  |  |  |  |
Supplemental Life Plan benefit obligation |  | $ 100,000 | $ 100,000 | $ 100,000 |
Number of employees in multiemployer health and welfare plan |  | 610 | 610 |  |
Required heath and welfare contribution by employer per active employee | 5.50 | 5.00 |  |  |
Multiemployer health and welfare plan, period contributions |  |  | $ 6,700,000 | $ 6,900,000 | $ 6,800,000

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- Definition Amount of contributions made to multiemployer health and welfare plan by the employer. + References No definition available. + Details
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- Definition Number of employees who participate in a multiemployer health and welfare plan that covers medical, dental, and life insurance for certain active and retired employees. + References No definition available. + Details
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- Definition Required Heath and Welfare Contribution by Employer Per Active Employee + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Amount represents the Supplemental Life Plan for certain executives, which provides them with an insured death benefit during employment with us and a target postretirement death benefit equal to one times his or her final base salary. + References No definition available. + Details
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