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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Securities [Member]
Fixed maturities, available for sale
Amortized Cost	$ 2,505,953	$ 2,586,821
Estimated Fair Value	2,546,107	2,613,406
U.S. Treasury obligations [Member]
Fixed maturities, available for sale
Amortized Cost	143,088	146,186
Due in one year or less	29,357
Due after one year through five years	92,270
Due after five years through ten years	18,815
Due after ten years	3,011
Estimated Fair Value	143,453	146,539
U.S. Government-sponsored enterprise obligations [Member]
Fixed maturities, available for sale
Amortized Cost	20,179	30,038
Due in one year or less	499
Due after one year through five years	7,873
Due after five years through ten years	11,678
Due after ten years	142
Estimated Fair Value	20,192	30,235
State and municipal bonds [Member]
Fixed maturities, available for sale
Amortized Cost	702,688	790,154
Due in one year or less	54,052
Due after one year through five years	243,955
Due after five years through ten years	308,236
Due after ten years	115,593
Estimated Fair Value	721,836	800,463
Corporate debt [Member]
Fixed maturities, available for sale
Amortized Cost	1,294,689	1,264,812
Due in one year or less	138,176
Due after one year through five years	733,558
Due after five years through ten years	418,955
Due after ten years	22,039
Estimated Fair Value	1,312,728	1,278,991
Residential mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	204,179	216,285
Estimated Fair Value	206,415	217,906
Agency commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	11,945	12,837
Estimated Fair Value	11,960	12,783
Other commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	17,087	19,571
Estimated Fair Value	17,157	19,611
Other asset-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	112,098	106,938
Estimated Fair Value	$ 112,366	$ 106,878

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=65884222&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=73527792&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=66010992&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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- Definition

Fair value of available-for-sale debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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+ References

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