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Retirement Plans - Measurement Date (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted-average assumptions used to determine net periodic pension cost
Discount rate (as a percent)	4.10%	3.50%	4.00%
Defined Benefit Plan, Benefit Obligation	$ 0
Non-contributory defined benefit pension plan
Accumulated benefit obligation in excess of plan assets
Projected benefit obligation		$ 28,906
Accumulated benefit obligation		28,906
Fair value of plan assets		$ 30,545
Weighted-average assumptions used to determine net periodic pension cost
Discount rate (as a percent)	4.10%	3.50%	4.00%
Expected long-term return on plan assets (as a percent)	7.75%	7.75%	7.75%
Defined Benefit Plan, Benefit Obligation		$ 28,906	$ 31,500	$ 28,800
Number of shares repurchased	0

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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