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Pension and Postretirement Benefits Other Than Pension Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
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 (benefit) reflected in other gains and (losses), net in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
Interest cost | ​ | $ | 675 | ​ | $ | 878 | ​ | $ | 1,351 | ​ | $ | 1,756 | ​
Expected return on plan assets | ​ |  | (1,054) | ​ |  | (943) | ​ |  | (2,109) | ​ |  | (1,887) | ​
Amortization of net actuarial loss | ​ |  | 281 | ​ |  | 286 | ​ |  | 563 | ​ |  | 573 | ​
Total net periodic pension expense (benefit) | ​ | $ | (98) | ​ | $ | 221 | ​ | $ | (195) | ​ | $ | 442 | ​
Postretirement Health Coverage [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 other gains and (losses), net in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
Interest cost | ​ | $ | 18 | ​ | $ | 25 | ​ | $ | 35 | ​ | $ | 50 | ​
Amortization of net actuarial loss | ​ |  | 64 | ​ |  | 62 | ​ |  | 127 | ​ |  | 123 | ​
Amortization of prior service credit | ​ |  | (329) | ​ |  | (329) | ​ |  | (657) | ​ |  | (657) | ​
Total net postretirement benefit income | ​ | $ | (247) | ​ | $ | (242) | ​ | $ | (495) | ​ | $ | (484) | ​

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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=118255775&loc=d3e1928-114920 + Details
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