Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt (Narrative) (Details) - USD ($)		9 Months Ended
Debt (Narrative) (Details) - USD ($)	Jul. 21, 2021	Sep. 30, 2021	Sep. 30, 2020
Line of Credit Facility [Line Items]
Repayments of senior debt		$ 50,000,000	$ 0
2021 Series A Notes
Line of Credit Facility [Line Items]
Repayments of senior debt	$ 50,000,000
2022 Series A Notes \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 75,000,000