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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
Schedule Of Defined Benefit Plans Disclosures Text Block | 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 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 + Details
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