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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Liabilities
Liabilities, fair value	$ 1,735	$ 785
Total Return Swap [Member]
Assets
Total assets, fair value	0	667
Call Option [Member]
Liabilities
Liabilities, fair value	146	20
Note Receivable [Member]
Assets
Total assets, fair value	5,585	0
Investments [Member]
Assets
Total assets, fair value	3,727,332	3,547,560
Total Return Swap [Member]
Liabilities
Liabilities, fair value	1,589	765
Borrowings [Member] | Secured Debt [Member]
Liabilities
Liabilities, fair value	0	140,000
Borrowings [Member] | Unsecured debt [Member]
Liabilities
Liabilities, fair value	$ 385,733	$ 180,000

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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