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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Liabilities
Liabilities fair value	$ 1,323	$ 785
Investments [Member]
Assets
Assets	3,732,728	3,547,560
Notes Receivable [Member]
Assets
Assets	5,565	0
Total Return Swap [Member]
Liabilities
Liabilities fair value	1,200	765
Equity Contract [Member]
Liabilities
Liabilities fair value	123	20
Total Return Swap [Member]
Assets
Assets	0	667
Secured Debt [Member] | Borrowings [Member]
Liabilities
Liabilities fair value	0	140,000
Unsecured Debt [Member]
Liabilities
Liabilities fair value	375,000
Unsecured Debt [Member] | Borrowings [Member]
Liabilities
Liabilities fair value	$ 385,583	$ 180,000

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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