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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for the three and nine months ended September 30, 2013 and 2012 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended September 30, |  | Three months ended September 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 2,000 |  |  | $ | 1,910 |  |  | $ | 590 |  |  | $ | 673 |
Interest Cost |  | 1,017 |  |  | 1,065 |  |  | 392 |  |  | 418 |
Expected return on plan assets |  | (933 | ) |  | (766 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 152 |  |  | 102 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 808 |  |  | 851 |  |  | 279 |  |  | 380 |
Net periodic benefit cost |  | $ | 3,044 |  |  | $ | 3,162 |  |  | $ | 1,261 |  |  | $ | 1,471 |
|  | Pension Benefits |  | Other Benefits
|  | Nine months ended September 30, |  | Nine months ended September 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 6,012 |  |  | $ | 5,638 |  |  | $ | 1,411 |  |  | $ | 1,231 |
Interest Cost |  | 3,055 |  |  | 3,135 |  |  | 1,015 |  |  | 935 |
Expected return on plan assets |  | (2,800 | ) |  | (2,299 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 459 |  |  | 288 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 2,427 |  |  | 2,514 |  |  | 651 |  |  | 557 |
Net periodic benefit cost |  | $ | 9,153 |  |  | $ | 9,276 |  |  | $ | 3,077 |  |  | $ | 2,723 |
The Company has made pension contributions of $6.8 million during the first nine months of 2013 and does not expect to make any additional pension contributions in 2013.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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