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Retirement Plans, Information About Plan Assets and Asset Allocation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Higman [Member] |  |  |  |
Information about Plan Assets [Abstract] |  |  |  |
Decrease in pension plan projected benefit obligation |  | $ (3,081) |  |
Pension contributions | $ 6,717 |  |  |
Expected additional contribution |  | $ 1,385 |  |
Pension Plan [Member] |  |  |  |
Information about Plan Assets [Abstract] |  |  |  |
Service period of participants not impacted by pension plan amendment |  | 15 years |  |
Age of plan participants not impacted by pension plan amendment |  | 50 years |  |
Service period of participants who are age fifty not impacted by pension plan amendment |  | 10 years |  |
Decrease in pension plan projected benefit obligation |  | $ (33,433) |  |
Pension contributions |  | 8,102 | $ 0 |
Expected additional contribution |  | 2,395 | 0 |
Fair value of plan assets |  | $ 303,151 | $ 294,995 | $ 257,517
Expected long-term rate of return on plan assets |  | 7.00% | 7.00% | 7.50%
Contribution percentage to defined contribution plan |  | 85.00% |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Asset allocations |  | 100.00% | 100.00% |
Pension Plan [Member] | U.S. Equity Securities [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Asset allocations |  | 52.00% | 51.00% |
Target allocations |  | 50.00% |  |
Pension Plan [Member] | U.S. Equity Securities [Member] | Minimum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 30.00% |  |
Pension Plan [Member] | U.S. Equity Securities [Member] | Maximum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 70.00% |  |
Pension Plan [Member] | International Equity Securities [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Asset allocations |  | 17.00% | 21.00% |
Target allocations |  | 20.00% |  |
Pension Plan [Member] | International Equity Securities [Member] | Minimum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 0.00% |  |
Pension Plan [Member] | International Equity Securities [Member] | Maximum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 30.00% |  |
Pension Plan [Member] | Debt Securities [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Asset allocations |  | 28.00% | 28.00% |
Target allocations |  | 30.00% |  |
Pension Plan [Member] | Debt Securities [Member] | Minimum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 15.00% |  |
Pension Plan [Member] | Debt Securities [Member] | Maximum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 55.00% |  |
Pension Plan [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Asset allocations |  | 3.00% | 0.00% |
Target allocations |  | 0.00% |  |
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Minimum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 0.00% |  |
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Maximum [Member] |  |  |  |
Asset Allocation Among Asset Categories [Abstract] |  |  |  |
Target allocations |  | 5.00% |  |
Other Postretirement Benefits [Member] |  |  |  |
Information about Plan Assets [Abstract] |  |  |  |
Pension contributions |  | $ 103 | $ 75 |
Expected additional contribution |  | 66 | 48 |
Fair value of plan assets |  | $ 0 | $ 0 | $ 0
Pension plan defined benefit plan cost increase limit percentage |  | 4.00% |  |

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