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Defined Benefit Plan (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |
Service cost | $ 2,390,000 |  | $ 1,479,000 | $ 7,170,000 |  | $ 4,437,000 |  |
Interest cost | 2,860,000 |  | 2,113,000 | 8,580,000 |  | 6,338,000 |  |
Expected return on assets | (4,126,000) |  | (2,310,000) | (12,429,000) |  | (6,929,000) |  |
Unrecognized actuarial loss | 1,296,000 |  | 1,056,000 | 3,888,000 |  | 3,168,000 |  |
Amortization of prior service cost | 39,000 |  | 61,000 | 115,000 |  | 184,000 |  |
Net periodic benefit cost | 2,459,000 |  | $ 2,399,000 | 7,324,000 |  | $ 7,198,000 |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 269,261,000 |  |  | 269,261,000 |  |  | $ 260,747,000 |
Employer Contributions [Abstract] |  |  |  |  |  |  |  |
Estimated employer contributions for the current fiscal year | 14,594,000 |  |  | 14,594,000 |  |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 9,360,000 |  |  | 9,360,000 |  |  |  |
Quoted Prices in Active Markets for Identical Assets |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 198,577,000 |  |  | 198,577,000 |  |  | 192,752,000 |
Significant Observable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 70,684,000 |  |  | 70,684,000 |  |  | 67,995,000 |
Significant Unobservable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 0 |  |  | 0 |  |  | 0 |
Cash and cash equivalents |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 7,921,000 |  |  | 7,921,000 |  |  | 11,801,000 |
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 7,921,000 |  |  | 7,921,000 |  |  | 11,801,000 |
Cash and cash equivalents | Significant Observable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 0 |  |  | 0 |  |  | 0 |
Cash and cash equivalents | Significant Unobservable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 0 |  |  | 0 |  |  | 0 |
Actively Managed | Equity securities (a) |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 159,687,000 | [1] |  | 159,687,000 | [1] |  | 157,050,000 | [2]
Actively Managed | Equity securities (a) | Quoted Prices in Active Markets for Identical Assets |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 155,850,000 | [1] |  | 155,850,000 | [1] |  | 149,265,000 | [2]
Actively Managed | Equity securities (a) | Significant Observable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 3,837,000 | [1] |  | 3,837,000 | [1] |  | 7,785,000 | [2]
Actively Managed | Equity securities (a) | Significant Unobservable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Fixed Income | Fixed income (b) |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 101,653,000 | [3] |  | 101,653,000 | [3] |  | 91,896,000 | [4]
Fixed Income | Fixed income (b) | Quoted Prices in Active Markets for Identical Assets |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 34,806,000 | [3] |  | 34,806,000 | [3] |  | 31,686,000 | [4]
Fixed Income | Fixed income (b) | Significant Observable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | 66,847,000 | [3] |  | 66,847,000 | [3] |  | 60,210,000 | [4]
Fixed Income | Fixed income (b) | Significant Unobservable Inputs |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |
Fair value of plan assets | $ 0 | [3] |  | $ 0 | [3] |  | $ 0 | [4]
[1] | Actively managed portfolio of equity securities with the goal to exceed the benchmark performance
[2] |
[3] | Actively managed portfolio of fixed income securities with the goal to exceed the benchmark performance
[4] |

X
- Definition The employer's best estimate of total contributions expected to be paid to the plan for the current fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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