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Employee Benefit Plans (Tables) (Defined Benefit Pension) | 3 Months Ended
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Mar. 31, 2013
Defined Benefit Pension |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | For the three-month periods ended March 31, 2013, and 2012 the components of pension expense are as follows:
| Three months ended March 31 |
| 2013 |  | 2012 |
Service cost | $ | 4,222 |  |  | $ | 2,827 |  |
Interest cost | 5,895 |  |  | 4,496 |  |
Expected return on assets | (6,931 | ) |  | (5,379 | ) |
Amortization of prior service cost | 53 |  |  | 53 |  |
Amortization of net actuarial loss | 4,251 |  |  | 2,737 |  |
Total pension expense | $ | 7,490 |  |  | $ | 4,734 |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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