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Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2016
Employee Benefits [Abstract] |
Components of Net Periodic Benefit Cost for Postretirement Benefit Plans | The components of net periodic benefit cost for our postretirement benefit plans for the three months and nine months ended September 30, 2016 and 2015 were as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
Postretirement benefits |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 4 |  |  |  | 12 |  |  |  | 10 |  |  |  | 20 |
Amortization of prior service cost |  |  | (14 | ) |  |  | (27 | ) |  |  | (41 | ) |  |  | (85 | )
Actuarial net loss |  |  | 194 |  |  |  | 382 |  |  |  | 584 |  |  |  | 1,144 |
Net periodic benefit cost |  | $ | 184 |  |  | $ | 367 |  |  | $ | 553 |  |  | $ | 1,079 |

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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=65897934&loc=d3e1928-114920 + Details
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