The cumulative amount of the reporting entity's undistributed earnings or deficit.

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

General - Investments in Debt and Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2018
Debt Securities, Available-for-sale [Line Items]
Net unrealized investment gains	$ 688,819	$ 564,392
ASU adoption adjustment
Debt Securities, Available-for-sale [Line Items]
Net unrealized investment gains			$ 4,600