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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Liabilities
Liabilities fair value	$ 320,785	$ 301,785
Investments [Member]
Assets
Assets fair value	3,547,560	3,380,642
Total Return Swap [Member]
Assets
Assets fair value	667	0
Liabilities
Liabilities fair value	765	11,525
Secured Debt [Member] | Borrowings [Member]
Liabilities
Liabilities fair value	140,000	140,000
Unsecured Debt [Member] | Borrowings [Member]
Liabilities
Liabilities fair value	180,000	150,000
Options Sold [Member]
Liabilities
Liabilities fair value	$ 20	$ 260

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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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-Name Accounting Standards Codification
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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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