Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Beginning Balance	$ 82,541	$ 182,255
Earnings	(3,905)	29,065
Other Comprehensive Income	11,455	(31,735)
Purchases	283	15,540
Sales	(11,274)	(90,355)
Paydowns / Maturities	(17,171)	(22,318)
In	93	89
Out	0	0
Ending Balance	62,022	82,541
Equity Securities Available For Sale [Member]
Beginning Balance	13,862	91,005
Earnings	1,126	28,947
Other Comprehensive Income	(1,737)	(30,865)
Purchases	0	0
Sales	(11,222)	(75,225)
Paydowns / Maturities	0	0
In	0	0
Out	0	0
Ending Balance	2,029	13,862
Fixed Maturities Securities [Member]
Beginning Balance	67,828	88,063
Earnings	(1,497)	(454)
Other Comprehensive Income	9,622	(870)
Purchases	283	15,271
Sales	0	(11,864)
Paydowns / Maturities	(17,171)	(22,318)
In	0	0
Out	0	0
Ending Balance	59,065	67,828
Corporate [Member] \| Fixed Maturities Securities [Member]
Beginning Balance	67,828	88,063
Earnings	(1,497)	(454)
Other Comprehensive Income	9,622	(870)
Purchases	283	15,271
Sales	0	(11,864)
Paydowns / Maturities	(17,171)	(22,318)
In	0	0
Out	0	0
Ending Balance	59,065	67,828
Common Stocks [Member] \| Equity Securities Available For Sale [Member]
Beginning Balance	1,559	1,559
Earnings	0	0
Other Comprehensive Income	0	0
Purchases	0	0
Sales	(151)	0
Paydowns / Maturities	0	0
In	0	0
Out	0	0
Ending Balance	1,408	1,559
Preferred Stocks [Member] \| Equity Securities Available For Sale [Member]
Beginning Balance	12,303	89,446
Earnings	1,126	28,947
Other Comprehensive Income	(1,737)	(30,865)
Purchases	0	0
Sales	(11,071)	(75,225)
Paydowns / Maturities	0	0
In	0	0
Out	0	0
Ending Balance	621	12,303
Arbitrage Trading Account [Member]
Beginning Balance	851	3,187
Earnings	(3,534)	572
Other Comprehensive Income	3,570	0
Purchases	0	269
Sales	(52)	(3,266)
Paydowns / Maturities	0	0
In	93	89
Out	0	0
Ending Balance	928	851
Securities Sold But Not Yet Purchased [Member]
Beginning Balance	21
Earnings	(1)
Other Comprehensive Income	0
Purchases	0
Sales	0
Paydowns / Maturities	0
In	0
Out	0
Ending Balance	$ 20

Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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- Definition

Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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- Definition

Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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- Definition

Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

+ References

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- Definition

Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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