Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 |
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| Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items] | ||
| Plan Assets in Other Long Term Assets | $ (447) | $ (412) |
| Current Portion of Pension Plan Liability in Wages and Benefits Payable | 2,823 | 2,656 |
| Long-term portion of pension plan liability | 66,550 | 61,450 |
| Net Penison Plan Benefit Liability | $ 68,926 | $ 63,694 |
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- Definition This represents the current liability recognized in the balance sheet that is associated with the defined benefit pension plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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