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Pension Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Pension Plans [Abstract] |
Schedule of the components of pension (income) expense |
|  | For the Three Months Ended March 31, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 Total |  |  | 2015 Total |
($ in thousands) |  | Pension Plan |  |  | Pension Plan |  |  | SERP |  |  | SERP |  |  | Both Plans |  |  | Both Plans |
Service cost |  | $ | — |  |  |  | — |  |  |  | 27 |  |  |  | 79 |  |  |  | 27 |  |  |  | 79 |
Interest cost |  |  | 376 |  |  |  | 341 |  |  |  | 59 |  |  |  | 52 |  |  |  | 435 |  |  |  | 393 |
Expected return on plan assets |  |  | (675 | ) |  |  | (708 | ) |  |  | — |  |  |  | — |  |  |  | (675 | ) |  |  | (708 | )
Amortization of transition obligation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of net (gain)/loss |  |  | 60 |  |  |  | — |  |  |  | (9 | ) |  |  | (31 | ) |  |  | 51 |  |  |  | (31 | )
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic pension (income)/cost |  | $ | (239 | ) |  |  | (367 | ) |  |  | 77 |  |  |  | 100 |  |  |  | (162 | ) |  |  | (267 | )

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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=58740216&loc=d3e1928-114920 + Details
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