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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Liabilities
Total return swap	$ 9,797	$ 11,525
Liabilities, Fair Value Disclosure, Recurring	300,059	301,785
Level 2 [Member]
Liabilities
Liabilities, Fair Value Disclosure, Recurring	299,797	301,525
Secured Debt [Member] | Borrowings [Member]
Liabilities
Liabilities, Fair Value Disclosure, Recurring	140,000	140,000
Secured Debt [Member] | Borrowings [Member] | Level 2 [Member]
Liabilities
Liabilities, Fair Value Disclosure, Recurring	140,000	140,000
Unsecured Debt [Member] | Borrowings [Member]
Liabilities
Liabilities, Fair Value Disclosure, Recurring	150,000	150,000
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member]
Liabilities
Liabilities, Fair Value Disclosure, Recurring	150,000	150,000
Equity Contract [Member]
Liabilities
Equity contracts	262	260
Investments [Member]
Assets
Investments	$ 3,433,315	$ 3,380,642

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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities 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 860
-SubTopic 20
-Section 50
-Paragraph 4D
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Name Accounting Standards Codification
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-Name Regulation S-X (SX)
-Number 210
-Section 03
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