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Employee Benefit Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) Retiree shares | Dec. 31, 2017 USD ($) Retiree employee shares | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of retirees and dependents | Retiree | 337 | 340 |
Subsidy limit percentage of expected annual fully insured premium over age threshold | 60.00% |  |
Subsidy limit percentage of expected annual fully insured premium under age threshold | $ 648,000 |  |
Annual subsidy limit percentage increases for fully insured premium over age threshold | 3.50% |  |
Estimated contributions next year | $ 1,900,000 |  |
Liabilities, including the Company's common stock | 25,780,000 | $ 29,145,000 |
Defined contribution cost (credit) recognized | $ 3,100,000 | 2,600,000 | $ 1,800,000
Savings Investment Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching percent | 6.00% |  |
Maximum contribution, percent of employee salary | 10.00% |  |
Plan contributions charged to expense | $ 5,900,000 | 6,500,000 | 6,500,000
Deferred compensation plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Market value of the trust assets, excluding the Company's common stock | 14,700,000 | 15,000,000 |
Liabilities, including the Company's common stock | $ 25,800,000 | $ 29,100,000 |
Number of common stock deferred into the rabbi trust (in shares) | shares | 495,774 | 495,774 |
Company's common stock held in the rabbi trust | $ 5,100,000 | $ 5,100,000 |
Company contributions to deferred compensation plan | $ 1,100,000 | $ 1,000,000 | $ 600,000
West Virginia, Virginia, and Ohio |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employees terminated | employee |  | 100 |

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- Definition Represents the number of retired employees, including their spouses, eligible dependents and surviving spouses (retirees), to whom Company provides benefits under the plan. + References No definition available. + Details
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- Definition Represents the entity's subsidy which is limited to the percentage of the expected annual fully-insured premium. + References No definition available. + Details
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- Definition Represents the plan contributions that are charged to expense. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19833-108362 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19850-108362 + Details
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