Investments (Fixed Maturity and Equity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Amortized cost	$ 1,845,359	$ 1,870,654
Available-for-sale Securities, Debt Securities	1,863,768	1,878,514
Fixed maturity securities
Available-for-sale Securities [Abstract]
Amortized cost	1,845,359	1,870,654
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	45,630	42,755
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	27,221	34,895
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	1,863,768	1,878,514
U.S. corporate
Available-for-sale Securities [Abstract]
Amortized cost	717,002	709,694
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	21,341	20,400
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	6,249	8,283
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	732,094	721,811
U.S. government and agency
Available-for-sale Securities [Abstract]
Amortized cost	404,528	410,504
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	10,219	9,560
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	9,859	13,519
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	404,888	406,545
RMBS
Available-for-sale Securities [Abstract]
Amortized cost	216,834	238,676
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	2,541	2,033
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	2,122	2,322
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	217,253	238,387
Foreign corporate
Available-for-sale Securities [Abstract]
Amortized cost	237,844	237,412
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	3,396	2,998
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	6,874	8,070
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	234,366	232,340
CMBS
Available-for-sale Securities [Abstract]
Amortized cost	179,639	177,719
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	3,114	2,724
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	1,368	1,487
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	181,385	178,956
State and political subdivision
Available-for-sale Securities [Abstract]
Amortized cost	46,790	52,739
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	4,426	4,345
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	507	764
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	50,709	56,320
ABS
Available-for-sale Securities [Abstract]
Amortized cost	26,666	26,695
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	101	152
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	111	177
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	26,656	26,670
Foreign government
Available-for-sale Securities [Abstract]
Amortized cost	16,056	17,215
Available For Sale Securities Gross Unrealized Gain Accumulated Investments	492	543
Available For Sale Securities, Gross Unrealized Loss Accumulated Investments	131	273
Gross Unrealized OTTI Loss	0	0
Available-for-sale Securities, Debt Securities	$ 16,417	$ 17,485

Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income loss.

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 2: 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

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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- Definition

Amount of debt 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 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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