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Pension and Other Postretirement Benefit Plans - Assets that are Carried at Fair Value, and the Method Used to Determine Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Long Corporate Bond Fund [Member]
Pooled Separate Accounts
Average duration of bonds	3 months
Retirement Plan [Member]
Pooled Separate Accounts
Plan Investments	$ 27,720	$ 25,505	$ 22,419
Retirement Plan [Member] | Long Duration Bond Fund [Member]
Pooled Separate Accounts
Plan Investments	12,229	11,242
Retirement Plan [Member] | Long Corporate Bond Fund [Member]
Pooled Separate Accounts
Plan Investments	5,587	5,069
Retirement Plan [Member] | Prudential Short-term [Member]
Pooled Separate Accounts
Plan Investments	286	403
Retirement Plan [Member] | Investment Grade Bond Fund [Member]
Pooled Separate Accounts
Plan Investments	$ 9,618	$ 8,791

X

- Definition

Average duration of bonds compared to benchmark.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Paragraph 1
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- Details

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