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v3.20.4

Post-Retirement Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Retirement Benefits [Abstract] |
Defined contribution plan, increase (decrease) in cost recognized | $ 1,000

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in cost for defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanIncreaseDecreaseCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration