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Employee Benefit Plans (Tables) (Defined Benefit Pension) | 6 Months Ended
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Jun. 30, 2012
Defined Benefit Pension |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | For the three and six month periods ended June 30, 2012 and 2011 the components of pension expense are as follows:
| Three Months Ended June 30 |  | Six months ended June 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
Service cost | $ | 3,548 |  |  | $ | 4,062 |  |  | $ | 6,375 |  |  | $ | 6,633 |
Interest cost | 5,646 |  |  | 7,398 |  |  | 10,142 |  |  | 11,905 |
Expected return on assets | (6,755 | ) |  | (8,422 | ) |  | (12,134 | ) |  | (14,353 | )
Amortization of prior service cost | 52 |  |  | 66 |  |  | 105 |  |  | 105 |
Amortization of net actuarial loss | 2,738 |  |  | 1,582 |  |  | 5,475 |  |  | 3,191 |
Total pension expense | $ | 5,229 |  |  | $ | 4,686 |  |  | $ | 9,963 |  |  | $ | 7,481 |

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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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