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Defined Benefit Plan (Tables) | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic benefit costs for the defined benefit plans and other postretirement benefits for the three and nine months ended September 30, 2020, and 2019 are as follows:
| Three months ended September 30, |  | Nine months ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 2,390 |  |  | 1,479 |  |  | $ | 7,170 |  |  | 4,437 |
Interest cost | 2,860 |  |  | 2,113 |  |  | 8,580 |  |  | 6,338 |
Expected return on assets | (4,126 | ) |  | (2,310 | ) |  | (12,429 | ) |  | (6,929 | )
Unrecognized actuarial loss | 1,296 |  |  | 1,056 |  |  | 3,888 |  |  | 3,168 |
Amortization of prior service cost | 39 |  |  | 61 |  |  | 115 |  |  | 184 |
| $ | 2,459 |  |  | 2,399 |  |  | $ | 7,324 |  |  | 7,198 |
Schedule of Allocation of Plan Assets | The following tables summarize the fair values of plan assets by major categories as of September 30, 2020, and December 31, 2019:
| Fair Value Measurements at September 30, 2020
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Observable Inputs |  | Significant Unobservable Inputs
Asset Category | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Cash and cash equivalents | $ | 7,921 |  |  | 7,921 |  |  | — |  |  | — |
Equity securities (a) | 159,687 |  |  | 155,850 |  |  | 3,837 |  |  | — |
Fixed income (b) | 101,653 |  |  | 34,806 |  |  | 66,847 |  |  | — |
Total | $ | 269,261 |  |  | 198,577 |  |  | 70,684 |  |  | — |
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(a) | Actively managed portfolio of equity securities with the goal to exceed the benchmark performance
(b) | Actively managed portfolio of fixed income securities with the goal to exceed the benchmark performance
| Fair Value Measurements at December 31, 2019
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Observable Inputs |  | Significant Unobservable Inputs
Asset Category | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Cash and cash equivalents | $ | 11,801 |  |  | 11,801 |  |  | — |  |  | — |
Equity securities (a) | 157,050 |  |  | 149,265 |  |  | 7,785 |  |  | — |
Fixed income (b) | 91,896 |  |  | 31,686 |  |  | 60,210 |  |  | — |
Total | $ | 260,747 |  |  | 192,752 |  |  | 67,995 |  |  | — |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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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