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Employee Benefit Plans (Tables) (Defined Benefit Pension [Member]) | 9 Months Ended
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Sep. 30, 2011
Defined Benefit Pension [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs |
| Three Months Ended September 30 |  | Nine months ended September 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Service cost | $ | 3,316 |  |  | $ | 2,760 |  |  | $ | 9,949 |  |  | $ | 9,431 |
Interest cost | 5,953 |  |  | 5,192 |  |  | 17,858 |  |  | 17,738 |
Expected return on assets | (7,178 | ) |  | (6,533 | ) |  | (21,530 | ) |  | (22,551 | )
Amortization of prior service cost | 53 |  |  | 42 |  |  | 158 |  |  | 157 |
Amortization of net actuarial loss | 1,596 |  |  | 771 |  |  | 4,786 |  |  | 2,851 |
Total pension expense | $ | 3,740 |  |  | $ | 2,232 |  |  | $ | 11,221 |  |  | $ | 7,626 |

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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. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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