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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
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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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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition 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. + References No definition available. + Details
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