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Commitments and Contingencies (Narrative and Schedule of Future Minimum Rental Payments for Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 4,200	$ 3,300	$ 3,200
Aggregate future minimum lease payments due	11,200
2021	2,354
2022	2,085
2023	1,866
2024	1,832
2025	1,711
2026 and thereafter	1,397
Limited Partnerships
Other Commitments [Line Items]
Unfunded commitments	40,200
Fixed Maturity Securities
Other Commitments [Line Items]
Unfunded commitments	$ 27,000

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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