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Investments - Schedule of Available-for-sale Securities (Details) - USD ($)
$ in Thousands

Jun. 30, 2018

Dec. 31, 2017

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

$ 1,983,956

^[1]

$ 1,877,326

^[2]

Available-for-sale debt securities gross unrealized gain

27,452

^[1]

56,438

^[2]

Available-for-sale debt securities, gross unrealized loss

(25,518)

^[1]

(5,922)

^[2]

Available-for-sale debt securities, at fair value

1,985,890

^[1]

1,927,842

^[2]

Available-for-sale equity securities, cost

0

31,331

Available-for-sale equity securities, gross unrealized gain

9,796

Available-for-sale equity securities, gross unrealized loss

(20)

Available-for-sale equity securities, at fair value

41,107

Available-for-sale securities, amortized cost basis

1,908,657

Available-for-sale securities, gross unrealized gain

66,234

Available-for-sale securities, gross unrealized loss

(5,942)

Available-for-sale securities, fair value

1,968,949

U.S. Government and Agencies [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

11,636

11,577

Available-for-sale debt securities gross unrealized gain

165

283

Available-for-sale debt securities, gross unrealized loss

(87)

(47)

Available-for-sale debt securities, at fair value

11,714

11,813

Foreign Government [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

148,158

139,486

Available-for-sale debt securities gross unrealized gain

4,033

5,651

Available-for-sale debt securities, gross unrealized loss

(1,144)

(648)

Available-for-sale debt securities, at fair value

151,047

144,489

States and Political Subdivisions [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

54,943

54,714

Available-for-sale debt securities gross unrealized gain

1,076

1,554

Available-for-sale debt securities, gross unrealized loss

(388)

(141)

Available-for-sale debt securities, at fair value

55,631

56,127

Corporates [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

1,391,181

1,337,321

Available-for-sale debt securities gross unrealized gain

17,607

42,616

Available-for-sale debt securities, gross unrealized loss

(18,262)

(3,655)

Available-for-sale debt securities, at fair value

1,390,526

1,376,282

Residential Mortgage-backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

161,338

119,672

Available-for-sale debt securities gross unrealized gain

2,388

3,583

Available-for-sale debt securities, gross unrealized loss

(2,344)

(297)

Available-for-sale debt securities, at fair value

161,382

122,958

Commercial Mortgage-backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

136,639

134,003

Available-for-sale debt securities gross unrealized gain

1,973

2,299

Available-for-sale debt securities, gross unrealized loss

(2,469)

(910)

Available-for-sale debt securities, at fair value

136,143

135,392

Other Asset-backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale debt securities, amortized cost basis

80,061

80,553

Available-for-sale debt securities gross unrealized gain

210

452

Available-for-sale debt securities, gross unrealized loss

(824)

(224)

Available-for-sale debt securities, at fair value

$ 79,447

$ 80,781

[1]	Includes $0.2 million of other-than-temporary impairment ("OTTI") losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[2]	Includes $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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