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Investments (Available-For-Sale Securities) (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
Gross Unrealized Gains	1,203	1,264
Gross Unrealized Losses	818	911
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
Gross Unrealized Gains	241	388
Gross Unrealized Losses	161	191
Estimated Fair Value	28,701	30,235
State and municipal bonds [Member]
Fixed maturities, available for sale
Amortized Cost	755,639	790,154
Gross Unrealized Gains	19,139	17,261
Gross Unrealized Losses	4,717	6,952
Estimated Fair Value	770,061	800,463
Corporate debt [Member]
Fixed maturities, available for sale
Amortized Cost	1,291,140	1,264,812
Gross Unrealized Gains	21,812	22,659
Gross Unrealized Losses	6,979	8,480
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
Gross Unrealized Gains	3,407	3,667
Gross Unrealized Losses	1,956	2,046
Estimated Fair Value	207,906	217,906
Agency commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	12,727	12,837
Gross Unrealized Gains	63	89
Gross Unrealized Losses	102	143
Estimated Fair Value	12,688	12,783
Other commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	19,650	19,571
Gross Unrealized Gains	153	177
Gross Unrealized Losses	106	137
Estimated Fair Value	19,697	19,611
Other asset-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	111,214	106,938
Gross Unrealized Gains	191	207
Gross Unrealized Losses	213	267
Estimated Fair Value	111,192	106,878
Debt Securities [Member]
Fixed maturities, available for sale
Amortized Cost	2,573,272	2,586,821
Gross Unrealized Gains	46,209	45,712
Gross Unrealized Losses	15,052	19,127
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
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-Section 50
-Paragraph 5
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-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
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+ References

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