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Investments (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fixed maturities, available for sale
Amortized Cost	$ 2,148,140	$ 2,257,188
Gross Unrealized Gains	11,630	32,610
Gross Unrealized Losses	33,849	9,556
Estimated Fair Value	2,125,921	2,280,242
U.S. Treasury obligations
Fixed maturities, available for sale
Amortized Cost	148,588	134,323
Gross Unrealized Gains	249	485
Gross Unrealized Losses	2,380	1,181
Estimated Fair Value	146,457	133,627
U.S. Government-sponsored enterprise obligations
Fixed maturities, available for sale
Amortized Cost	32,331	21,089
Gross Unrealized Gains	21	73
Gross Unrealized Losses	650	206
Estimated Fair Value	31,702	20,956
State and municipal bonds
Fixed maturities, available for sale
Amortized Cost	326,705	618,414
Gross Unrealized Gains	5,488	14,248
Gross Unrealized Losses	1,093	419
Estimated Fair Value	331,100	632,243
Corporate debt
Fixed maturities, available for sale
Amortized Cost	1,213,362	1,157,660
Gross Unrealized Gains	4,655	15,205
Gross Unrealized Losses	22,390	5,707
Estimated Fair Value	1,195,627	1,167,158
Residential mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	208,052	196,741
Gross Unrealized Gains	1,150	2,438
Gross Unrealized Losses	4,966	1,335
Estimated Fair Value	204,236	197,844
Agency commercial mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	14,080	10,827
Gross Unrealized Gains	0	23
Gross Unrealized Losses	268	108
Estimated Fair Value	13,812	10,742
Other commercial mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	33,105	16,004
Gross Unrealized Gains	47	91
Gross Unrealized Losses	437	134
Estimated Fair Value	32,715	15,961
Other asset-backed securities
Fixed maturities, available for sale
Amortized Cost	171,917	102,130
Gross Unrealized Gains	20	47
Gross Unrealized Losses	1,665	466
Estimated Fair Value	$ 170,272	$ 101,711

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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
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