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Investments In Securities and Fair Value (Schedule of Cost-method Investments) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items]
Beginning balance	$ 8,688	$ 8,741
Other than temporary impairment losses, investments	0	0
Observable changes	0	0
Purchases and additional commitments paid	1,037	1,543
Sales, returns of capital, and other reductions	(873)	(1,596)
Ending balance	8,852	8,688
Cost-method Investments
Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items]
Beginning balance	8,688	8,741
Other than temporary impairment losses, investments	0	0
Observable changes	0	0
Purchases and additional commitments paid	1,037	1,543
Sales, returns of capital, and other reductions	(873)	(1,596)
Ending balance	$ 8,852	$ 8,688

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Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items]

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Other Investments and Securities, at Cost, Observable Changes

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Other Investments and Securities, at Cost, Purchases and Additional Commitments Paid

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Other Investments and Securities, at Cost, Sales, Returns of Capital, and Other Reductions

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562

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Includes other investments and securities that are not at fair value as of the balance sheet date and those that are not accounted for under the equity method.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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