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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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).

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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