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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2013
Employee Benefit Plans [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for the three and six months ended June 30, 2013 and 2012 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended June 30, |  | Three months ended June 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 2,129 |  |  | $ | 2,196 |  |  | $ | 410 |  |  | $ | 279 |
Interest Cost |  | 1,020 |  |  | 1,090 |  |  | 311 |  |  | 258 |
Expected return on plan assets |  | (1,100 | ) |  | (799 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 213 |  |  | 87 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 782 |  |  | 1,388 |  |  | 186 |  |  | 89 |
Net periodic benefit cost |  | $ | 3,044 |  |  | $ | 3,962 |  |  | $ | 907 |  |  | $ | 626 |
|  | Pension Benefits |  | Other Benefits
|  | Six months ended June 30, |  | Six months ended June 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 4,012 |  |  | $ | 3,728 |  |  | $ | 820 |  |  | $ | 558 |
Interest Cost |  | 2,038 |  |  | 2,070 |  |  | 623 |  |  | 517 |
Expected return on plan assets |  | (1,867 | ) |  | (1,533 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 307 |  |  | 186 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 1,619 |  |  | 1,663 |  |  | 372 |  |  | 177 |
Net periodic benefit cost |  | $ | 6,109 |  |  | $ | 6,114 |  |  | $ | 1,815 |  |  | $ | 1,252 |
The Company has made pension contributions of $3.4 million during the first six months of 2013 and expects to make total pension contributions of $6.8 million 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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