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Investments (Investments Held in a Loss Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Fair Value	$ 1,547,399	$ 850,838
Less than 12 months, Fair Value	1,329,365	603,468
More than 12 months, Fair Value	218,034	247,370
Unrealized Loss
Unrealized Loss	33,849	9,556
Less than 12 months, Unrealized Loss	25,384	4,314
More than 12 months, Unrealized Loss	8,465	5,242
U.S. Treasury obligations
Fair Value
Fair Value	128,506	110,788
Less than 12 months, Fair Value	96,926	67,135
More than 12 months, Fair Value	31,580	43,653
Unrealized Loss
Unrealized Loss	2,380	1,181
Less than 12 months, Unrealized Loss	1,589	554
More than 12 months, Unrealized Loss	791	627
U.S. Government-sponsored enterprise obligations
Fair Value
Fair Value	30,769	17,032
Less than 12 months, Fair Value	23,960	10,182
More than 12 months, Fair Value	6,809	6,850
Unrealized Loss
Unrealized Loss	650	206
Less than 12 months, Unrealized Loss	397	64
More than 12 months, Unrealized Loss	253	142
State and municipal bonds
Fair Value
Fair Value	100,622	23,122
Less than 12 months, Fair Value	98,073	15,168
More than 12 months, Fair Value	2,549	7,954
Unrealized Loss
Unrealized Loss	1,093	419
Less than 12 months, Unrealized Loss	1,035	102
More than 12 months, Unrealized Loss	58	317
Corporate debt
Fair Value
Fair Value	919,141	487,578
Less than 12 months, Fair Value	801,410	365,541
More than 12 months, Fair Value	117,731	122,037
Unrealized Loss
Unrealized Loss	22,390	5,707
Less than 12 months, Unrealized Loss	17,525	2,730
More than 12 months, Unrealized Loss	4,865	2,977
Residential mortgage-backed securities
Fair Value
Fair Value	173,133	109,659
Less than 12 months, Fair Value	131,124	64,121
More than 12 months, Fair Value	42,009	45,538
Unrealized Loss
Unrealized Loss	4,966	1,335
Less than 12 months, Unrealized Loss	2,839	402
More than 12 months, Unrealized Loss	2,127	933
Agency commercial mortgage-backed securities
Fair Value
Fair Value	13,812	4,423
Less than 12 months, Fair Value	11,929	2,458
More than 12 months, Fair Value	1,883	1,965
Unrealized Loss
Unrealized Loss	268	108
Less than 12 months, Unrealized Loss	135	34
More than 12 months, Unrealized Loss	133	74
Other commercial mortgage-backed securities
Fair Value
Fair Value	26,251	12,878
Less than 12 months, Fair Value	24,311	7,939
More than 12 months, Fair Value	1,940	4,939
Unrealized Loss
Unrealized Loss	437	134
Less than 12 months, Unrealized Loss	390	82
More than 12 months, Unrealized Loss	47	52
Other asset-backed securities
Fair Value
Fair Value	155,165	85,358
Less than 12 months, Fair Value	141,632	70,924
More than 12 months, Fair Value	13,533	14,434
Unrealized Loss
Unrealized Loss	1,665	466
Less than 12 months, Unrealized Loss	1,474	346
More than 12 months, Unrealized Loss	$ 191	$ 120

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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