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Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | $ (16,413,000) | $ 21,773,000 |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 4.60% | 3.89% | 4.58% |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 0 | $ 15,000,000 |  |
Expected long-term rate of return on plan assets |  | 7.00% |  |  |
Accumulated benefit obligation for the pension plan |  | $ 104,900,000 | $ 116,000,000 |  |
Common share purchased under pension plan, shares |  |  |  |  | 115,800
Common share purchased under pension plan, value |  |  |  |  | $ 7,000,000
Common share purchased under pension plan, value per share |  |  |  |  | $ 60.45
Fair value, pension plan common shares held, shares |  | 115,800 | 115,800 |  |
Fair value of common shares held by pension plan |  | $ 9,800,000 | $ 12,000,000 |  |
Fair value of common shares held by pension plan, per share |  | $ 84.95 | $ 104.00 |  |
Estimated net actuarial (loss) expected to be recognized in the next fiscal year |  | $ 1,882,000 |  |  |
Expected long-term return on plan assets |  | 7.00% | 7.00% | 7.25% |
Market value of pension plan assets |  | $ 177,100,000 | $ 195,700,000 |  |
Defined Contribution Plan, Cost |  | 3,000,000 | 1,300,000 | $ 1,300,000 |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year |  | 0 |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit expense |  | 1,000,000 | 1,700,000 | $ 1,500,000 |
Accrued benefit cost |  | 10,300,000 | 9,900,000 |  |
Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 147,100,000 | 169,600,000 |  |
Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 30,000,000 | 26,100,000 |  |
Level 3 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 0 | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0 |  |  |  |
Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Market value of pension plan assets |  | $ 2,000,000 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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