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Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Deferred contract costs	$ 38,518,000		$ 38,518,000		$ 37,928,000
Capitalized contract cost, amount capitalized during period	$ 2,243,000	$ 4,648,000	7,212,000	$ 9,710,000
Amortization of deferred contract costs			6,622,000	8,156,000
Accelerated amortization of deferred contract costs				$ 1,784,000
Capitalized contract cost impairment			$ 0

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- Definition

Capitalized Contract Cost, Accelerated Amortization

+ References

No definition available.

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- Definition

Capitalized Contract Cost, Amount Capitalized During Period

+ References

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- References

No definition available.

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Namespace Prefix:	srt_
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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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