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Investments (Available-For-Sale Securities) (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
Gross Unrealized Gains	49,682	45,712
Gross Unrealized Losses	9,528	19,127
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
Gross Unrealized Gains	1,092	1,264
Gross Unrealized Losses	727	911
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
Gross Unrealized Gains	140	388
Gross Unrealized Losses	127	191
Estimated Fair Value	20,192	30,235
State and municipal bonds [Member]
Fixed maturities, available for sale
Amortized Cost	702,688	790,154
Gross Unrealized Gains	21,217	17,261
Gross Unrealized Losses	2,069	6,952
Estimated Fair Value	721,836	800,463
Corporate debt [Member]
Fixed maturities, available for sale
Amortized Cost	1,294,689	1,264,812
Gross Unrealized Gains	23,274	22,659
Gross Unrealized Losses	5,235	8,480
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
Gross Unrealized Gains	3,369	3,667
Gross Unrealized Losses	1,133	2,046
Estimated Fair Value	206,415	217,906
Agency commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	11,945	12,837
Gross Unrealized Gains	77	89
Gross Unrealized Losses	62	143
Estimated Fair Value	11,960	12,783
Other commercial mortgage-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	17,087	19,571
Gross Unrealized Gains	152	177
Gross Unrealized Losses	82	137
Estimated Fair Value	17,157	19,611
Other asset-backed securities [Member]
Fixed maturities, available for sale
Amortized Cost	112,098	106,938
Gross Unrealized Gains	361	207
Gross Unrealized Losses	93	267
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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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
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-Section S99
-Paragraph 1
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