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Retirement Plans - Expenses Incurred And Charged Against Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Pension		$ (309)	$ (351)
Pension plan termination expense	$ 9,526
Employee savings plan/ 401(k)	6,659	7,948	7,381
Supplemental executive retirement plan	2,343	368	1,334
Post-retirement benefits	144	254	251
Non-contributory defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Expenses incurred and charged against operations	$ 18,672	$ 8,261	$ 8,615

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- Definition

Represents the total amount of net periodic benefit cost related to post retirement benefits, for the period.

+ References

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- Definition

Amount of cost of providing special or contractual termination benefits payable from defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

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Amount of cost (reversal of cost) for pension and other postretirement benefits.

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