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Employee Benefit Plans Unrecognized loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ (137) |  |
Unrecognized gains arising in current year | (2,532) | $ (937) | $ 1,400
Ending Balance | 65,091 | (137) |
Amount to be amortized from accumulated other comprehensive income (loss) in next twelve months | 2,300 |  |
Unrecognized Pension and Postretirement Plan Income (Cost) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | (15,001) | (15,089) | (14,923)
Ending Balance | (16,513) | (15,001) | (15,089)
Pension Plans | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |
Before tax |  |  |
AOCI before Tax, Attributable to Parent | 23,546 | 24,347 |
Reclass adjustment for postretirement plan gain included in net income | (1,859) | (1,981) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 3,787 | 1,180 |
AOCI before Tax, Attributable to Parent | 25,474 | 23,546 | 24,347
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | 18,337 | 18,961 |
Recognized component of periodic pension cost | (1,452) | (1,543) |
Unrecognized gains arising in current year | 2,958 | 919 |
Ending Balance | 19,843 | 18,337 | 18,961
Other Postretirement Benefit Plans | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost [Member] |  |  |
Before tax |  |  |
AOCI before Tax, Attributable to Parent | (3,476) | (3,940) |
Reclass adjustment for postretirement plan gain included in net income | 464 | 464 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, before Tax |  | 0 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 0 |  |
AOCI before Tax, Attributable to Parent | (3,012) | (3,476) | (3,940)
Other Postretirement Benefit Plans | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |
Before tax |  |  |
AOCI before Tax, Attributable to Parent | (948) | (1,096) |
Reclass adjustment for postretirement plan gain included in net income | 84 | 92 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, before Tax |  | 56 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 6 |  |
AOCI before Tax, Attributable to Parent | (858) | (948) | (1,096)
Other Postretirement Benefit Plans | Unrecognized Pension and Postretirement Plan Income (Cost) |  |  |
Before tax |  |  |
AOCI before Tax, Attributable to Parent | (4,424) | (5,036) |
Reclass adjustment for postretirement plan gain included in net income | 548 | 556 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, before Tax |  | 56 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 6 |  |
AOCI before Tax, Attributable to Parent | (3,870) | (4,424) | (5,036)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | (3,451) | (3,928) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Prior to Curtailment, Net of Tax |  | 433 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, Net of Tax |  | 44 |
Recognized component of periodic pension cost | 428 |  |
Unrecognized gains arising in current year | 5 |  |
Ending Balance | $ (3,018) | $ (3,451) | $ (3,928)

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