XML 49 R36.htm IDEA: XBRL DOCUMENT
v3.21.2

COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Defined benefit pension plan |
Employee Benefit Plans |
Components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ | ​ | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | (in thousands) | ​
Interest cost | ​ | $ | 860 | ​ | $ | 1,030 | ​ | $ | 2,580 | ​ | $ | 3,138 | ​
Expected return on plan assets | ​ |  | (1,671) | ​ |  | (1,413) | ​ |  | (5,013) | ​ |  | (4,396) | ​
Amortization of prior service cost | ​ | ​ | 47 | ​ | ​ | 47 | ​ | ​ | 140 | ​ | ​ | 140 | ​
Amortization of net loss | ​ |  | 1,141 | ​ |  | 969 | ​ |  | 3,424 | ​ |  | 3,096 | ​
Net periodic benefit cost (1) | ​ | $ | 377 | ​ | $ | 633 | ​ | $ | 1,131 | ​ | $ | 1,978 | ​
| (1) | Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of operations.

X
- 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
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |