Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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-SubTopic 10
-Section 50
-Paragraph 2
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of People Granted Awards

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Subsequent Events (Narrative) (Details) $ in Millions					12 Months Ended
Subsequent Events (Narrative) (Details) $ in Millions	Mar. 05, 2020 USD ($) officer shares	May 16, 2019 shares	Mar. 20, 2019 shares	Mar. 13, 2019 people shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Number of people granted awards \| people				3
Number of RSUs granted (in shares)		8,244	12,445	51,814	73,000	74,000	98,000
Award vesting period			3 years	3 years
Subsequent Event \| Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Restricted stock units grant date fair value \| $	$ 1.2
Number of RSUs granted (in shares)	44,269
Subsequent Event \| Restricted Stock Units (RSUs) \| Vesting on January 1, 2023
Subsequent Event [Line Items]
Award vesting rights (percentage)	25.00%
Subsequent Event \| Performance Shares
Subsequent Event [Line Items]
Award vesting period	3 years
Subsequent Event \| Executive Officer \| Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Number of people granted awards \| officer	3
Subsequent Event \| Executive Officer \| Performance Shares
Subsequent Event [Line Items]
Percentage of performance based units on total units approved	75.00%