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Pension and Other Post Retirement Benefit Plans - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2005 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of employees covered by plan |  | 13.00% |  |
Minimum participant attained age | 55 years |  |  |
Requisite service period (at least) | 10 years |  |  |
Release of benefit obligation for plan settlement |  |  | $ 4,600,000 |
Settlement charge |  |  | (3,803,000) |
Settlement loss recognized |  |  | 761,000 |
Accumulated benefit obligation |  | 73,193,000 | 82,157,000 |
Minimum required contribution in next fiscal year |  | $ 0 |  |
Requisite service period |  | 1000 hours |  |
Employer percentage contribution |  | 2.00% |  |
Vesting period |  | 5 years |  |
Expense recognized in the period |  | $ 5,114,000 | 3,691,000 | $ 3,441,000
Percentage of the premiums paid by plan participants |  | 100.00% |  |
Curtailment gain |  |  |  | 2,157,000
Post retirement plan expense |  |  | (301,000) | (2,437,000)
Fair value of plan assets |  | $ 76,736,000 | 85,213,000 | 83,557,000
Net periodic pension benefit cost |  | (1,693,000) | 654,000 | 509,000
Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 71,277,000 | 78,280,000 |
Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 5,459,000 | $ 6,933,000 |
Contribution for first 3% |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount of discretionary contributions made by employer to defined contribution plan, percent |  | 100.00% |  |
Maximum annual contribution percentage per employee |  | 3.00% |  |
Contribution after first 3% |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount of discretionary contributions made by employer to defined contribution plan, percent |  | 50.00% |  |
Maximum annual contribution percentage per employee |  | 3.00% |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Age of plan participants |  | 55 years |  |
Minimum | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maturities of debt securities |  | 15 days | 15 days |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Age of plan participants |  | 65 years |  |
Maximum | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maturities of debt securities |  | 8 years 2 months 25 days | 8 years 10 months |
Weighted Average | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maturities of debt securities |  | 4 years 3 months 15 days | 4 years 6 months 12 days |
Non-qualified plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension benefit cost |  | $ 161,000 | $ 213,000 | $ 217,000

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