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Commitments and Contingencies (Lease Commitments) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) lease | Sep. 30, 2021 USD ($) lease
Lease Commitments |  |
Lease liability | $ 74,945 | $ 74,945
Number of lease commitments | lease | 2 | 2
Corporate headquarters |  |
Lease Commitments |  |
Lease cost | $ 1,100 | $ 2,900
New Corporate Headquarters Location |  |
Lease Commitments |  |
Lease term | 15 years | 15 years
Renewal term | 5 years | 5 years

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- Definition Amount of lessee's undiscounted obligation for lease payment 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=123408670&loc=SL77918701-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Details
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