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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments [Member]
Assets
Total assets, fair value	$ 4,061,224	$ 3,768,091
Financing Receivable [Member]
Assets
Total assets, fair value	5,588	5,557
Fair Value, Measurements, Recurring [Member]
Liabilities
Liabilities, fair value	3,028	4,854
Fair Value, Measurements, Recurring [Member] | Call Option [Member]
Liabilities
Liabilities, fair value	716	3
Fair Value, Measurements, Recurring [Member] | Total Return Swap [Member]
Liabilities
Liabilities, fair value	2,312	4,851
Fair Value, Measurements, Recurring [Member] | Borrowings [Member] | Unsecured debt [Member]
Liabilities
Liabilities, fair value	$ 372,638	$ 362,674

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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