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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Liabilities
Liabilities	$ 1,690	$ 785
Total Return Swap [Member]
Assets
Assets	0	667
Investments [Member]
Assets
Assets	3,600,498	3,547,560
Total Return Swap [Member]
Liabilities
Liabilities	1,405	765
Borrowings [Member] | Secured Debt [Member]
Liabilities
Liabilities	0	140,000
Borrowings [Member] | Unsecured debt [Member]
Liabilities
Liabilities	374,633	180,000
Call Option [Member]
Liabilities
Liabilities	$ 285	$ 20

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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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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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