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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
U.S. Treasury obligations [Member]
Fixed maturities, available for sale
Amortized Cost	$ 122,855	$ 163,714
Due in one year or less	10,703
Due after one year through five years	94,067
Due after five years through ten years	15,923
Due after ten years	3,199
Total Fair Value	123,892	166,512
U.S. Government-sponsored enterprise obligations [Member]
Fixed maturities, available for sale
Amortized Cost	25,456	38,022
Due in one year or less	2,290
Due after one year through five years	16,593
Due after five years through ten years	7,312
Due after ten years	139
Total Fair Value	26,334	39,563
State and municipal bonds [Member]
Fixed maturities, available for sale
Amortized Cost	904,719	1,015,555
Due in one year or less	48,752
Due after one year through five years	332,489
Due after five years through ten years	428,872
Due after ten years	130,522
Total Fair Value	940,635	1,062,615
Corporate debt [Member]
Fixed maturities, available for sale
Amortized Cost	1,296,128	1,389,970
Due in one year or less	104,746
Due after one year through five years	698,148
Due after five years through ten years	455,849
Due after ten years	32,943
Total Fair Value	1,291,686	1,417,101
Residential mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	233,659	266,306
Total Fair Value	238,387	276,056
Agency commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	10,851	15,344
Total Fair Value	10,999	15,493
Other commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	29,983	50,025
Total Fair Value	30,134	51,063
Other asset-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	98,412	116,541
Total Fair Value	98,220	116,624
Debt Securities [Member]
Fixed maturities, available for sale
Amortized Cost	2,722,063	3,055,477
Total Fair Value	$ 2,760,287	$ 3,145,027

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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- Definition

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+ References

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 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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+ References

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