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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
U.S. Treasury obligations [Member]
Fixed maturities, available for sale
Amortized Cost	$ 147,826	$ 146,186
Due in one year or less	28,876
Due after one year through five years	98,304
Due after five years through ten years	18,042
Due after ten years	2,989
Estimated Fair Value	148,211	146,539
U.S. Government-sponsored enterprise obligations [Member]
Fixed maturities, available for sale
Amortized Cost	28,621	30,038
Due in one year or less	12,863
Due after one year through five years	7,781
Due after five years through ten years	7,918
Due after ten years	139
Estimated Fair Value	28,701	30,235
State and municipal bonds [Member]
Fixed maturities, available for sale
Amortized Cost	755,639	790,154
Due in one year or less	66,017
Due after one year through five years	264,597
Due after five years through ten years	348,641
Due after ten years	90,806
Estimated Fair Value	770,061	800,463
Corporate debt [Member]
Fixed maturities, available for sale
Amortized Cost	1,291,140	1,264,812
Due in one year or less	122,549
Due after one year through five years	764,626
Due after five years through ten years	388,119
Due after ten years	30,679
Estimated Fair Value	1,305,973	1,278,991
Residential mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	206,455	216,285
Estimated Fair Value	207,906	217,906
Agency commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	12,727	12,837
Estimated Fair Value	12,688	12,783
Other commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	19,650	19,571
Estimated Fair Value	19,697	19,611
Other asset-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	111,214	106,938
Estimated Fair Value	111,192	106,878
Debt Securities [Member]
Fixed maturities, available for sale
Amortized Cost	2,573,272	2,586,821
Estimated Fair Value	$ 2,604,429	$ 2,613,406

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

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+ References

No definition available.

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+ References

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