Fair Value (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Feb. 17, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Initial borrowing in senior notes	$ 450,000	$ 450,000
Fair value	485,415
Difference	$ 35,415

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