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Pension and Postretirement Benefits Other Than Pension Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Pension Plan [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Pension and Postretirement Benefit (Income) Expense | Net periodic pension expense reflected in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Interest cost |  | $ | 808 |  | $ | 891 |  | $ | 2,422 |  | $ | 2,706
Expected return on plan assets |  |  | (1,087) |  |  | (1,051) |  |  | (3,259) |  |  | (3,098)
Amortization of net actuarial loss |  |  | 259 |  |  | 282 |  |  | 778 |  |  | 861
Net settlement loss |  |  | 1,004 |  |  | 1,218 |  |  | 1,004 |  |  | 1,218
Total net periodic pension expense |  | $ | 984 |  | $ | 1,340 |  | $ | 945 |  | $ | 1,687
Other Postretirement Benefit Plan [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Pension and Postretirement Benefit (Income) Expense | Net postretirement benefit income reflected in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Interest cost |  | $ | 24 |  | $ | 27 |  | $ | 72 |  | $ | 81
Amortization of net actuarial loss |  |  | 64 |  |  | 61 |  |  | 193 |  |  | 184
Amortization of prior service credit |  |  | (329) |  |  | (328) |  |  | (986) |  |  | (985)
Total net postretirement benefit income |  | $ | (241) |  | $ | (240) |  | $ | (721) |  | $ | (720)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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