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Benefit Plan (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 0 | $ 0 |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | $ 28,551,000 | $ (16,413,000) |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 3.53% | 4.60% | 3.89% |
Expected long-term rate of return on plan assets |  | 7.00% |  |  |
Accumulated benefit obligation for the pension plan |  | $ 129,300,000 | $ 104,900,000 |  |
Common share purchased under pension plan, shares |  |  |  |  | 115,800
Common share purchased under pension plan, value |  |  |  |  | $ 7,000,000.0
Common share purchased under pension plan, value per share |  |  |  |  | $ 60.45
Fair value of common shares held by pension plan |  | $ 11,900,000 | $ 9,800,000 |  |
Fair value of common shares held by pension plan, per share |  | $ 102.38 | $ 84.95 |  |
Fair value, pension plan common shares held, shares |  | 115,800 |  |  |
Estimated net actuarial (loss) expected to be recognized in the next fiscal year |  | $ 1,200,000 |  |  |
Market value of pension plan assets |  | 210,600,000 | $ 177,100,000 |  |
Defined Contribution Plan, Cost |  | 3,900,000 | 3,000,000.0 | $ 1,300,000 |
Defined Benefit Plan, Plan Assets, Amount |  | 210,623,000 | 177,077,000 | 195,735,000 |
Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0 |  |  |  |
Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 180,000,000.0 | 147,100,000 |  |
Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 30,600,000 | 30,000,000.0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 0 | 0 |  |
Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 8,900,000 |  |  |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year |  | (16,000) |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued benefit cost |  | 11,000,000.0 | 10,300,000 |  |
Benefit expense |  | $ 1,300,000 | $ 1,000,000.0 | $ 1,700,000 |

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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 (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: 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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