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Employee Benefit Plans - Weighed Average Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
DB Pension Plans
Discount Rates
Benefit Cost for Plan Year	4.08%	3.43%	3.89%
Benefit Obligation at End of Plan Year	3.04%	4.08%	3.43%
Expected long-term return on plan assets	7.00%	7.25%	7.25%
Life and Healthcare Plan
Discount Rates
Benefit Cost for Plan Year	4.13%	3.51%	3.97%
Benefit Obligation at End of Plan Year	3.10%	4.13%	3.51%
Rate of compensation increase
Benefit Cost for Plan Year	4.00%	5.00%	5.00%
Benefit Obligation at End of Plan Year	4.00%	4.00%	5.00%
SERP Plan
Discount Rates
Benefit Cost for Plan Year	4.16%	3.55%	4.10%
Benefit Obligation at End of Plan Year	3.14%	4.16%	3.55%
Rate of compensation increase
Benefit Cost for Plan Year	5.00%	5.00%	5.00%
Benefit Obligation at End of Plan Year	5.00%	5.00%	5.00%

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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-Publisher FASB
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-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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