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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | $ 1,660,347 | [1] | $ 1,690,043 | [2]
Available-for-sale debt securities gross unrealized gain | 104,051 | [1] | 68,467 | [2]
Available-for-sale debt securities, gross unrealized loss | (3,224) | [1] | (27,051) | [2]
Available-for-sale debt securities, at fair value | 1,761,174 | [1] | 1,731,459 | [2]
Available-for-sale equity securities, cost | 37,966 |  | 39,969 |
Available-for-sale equity securities, gross unrealized gain | 10,147 |  | 8,252 |
Available-for-sale equity securities, gross unrealized loss | (574) |  | (382) |
Available-for-sale equity securities, at fair value | 47,539 |  | 47,839 |
Available-for-sale securities, amortized cost basis | 1,698,313 |  | 1,730,012 |
Available-for-sale securities, gross unrealized gain | 114,198 |  | 76,719 |
Available-for-sale securities, gross unrealized loss | (3,798) |  | (27,433) |
Available-for-sale securities, fair value | 1,808,713 |  | 1,779,298 |
U.S. Government and Agencies [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 15,515 |  | 20,233 |
Available-for-sale debt securities gross unrealized gain | 547 |  | 448 |
Available-for-sale debt securities, gross unrealized loss | (1) |  | (22) |
Available-for-sale debt securities, at fair value | 16,061 |  | 20,659 |
Foreign Government [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 121,993 |  | 114,656 |
Available-for-sale debt securities gross unrealized gain | 9,843 |  | 7,082 |
Available-for-sale debt securities, gross unrealized loss | (106) |  | (1,522) |
Available-for-sale debt securities, at fair value | 131,730 |  | 120,216 |
States and Political Subdivisions [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 43,326 |  | 38,995 |
Available-for-sale debt securities gross unrealized gain | 3,167 |  | 2,111 |
Available-for-sale debt securities, gross unrealized loss | (34) |  | (541) |
Available-for-sale debt securities, at fair value | 46,459 |  | 40,565 |
Corporates [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 1,246,969 |  | 1,276,965 |
Available-for-sale debt securities gross unrealized gain | 78,951 |  | 49,008 |
Available-for-sale debt securities, gross unrealized loss | (2,840) |  | (24,211) |
Available-for-sale debt securities, at fair value | 1,323,080 |  | 1,301,762 |
Residential Mortgage-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 78,549 |  | 94,532 |
Available-for-sale debt securities gross unrealized gain | 6,836 |  | 6,814 |
Available-for-sale debt securities, gross unrealized loss | (107) |  | (121) |
Available-for-sale debt securities, at fair value | 85,278 |  | 101,225 |
Other Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 49,524 |  | 46,996 |
Available-for-sale debt securities gross unrealized gain | 352 |  | 129 |
Available-for-sale debt securities, gross unrealized loss | (85) |  | (79) |
Available-for-sale debt securities, at fair value | 49,791 |  | 47,046 |
Commercial Mortgage-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, amortized cost basis | 104,471 |  | 97,666 |
Available-for-sale debt securities gross unrealized gain | 4,355 |  | 2,875 |
Available-for-sale debt securities, gross unrealized loss | (51) |  | (555) |
Available-for-sale debt securities, at fair value | $ 108,775 |  | $ 99,986 |
[1] | Includes approximately $0.1 million of other-than-temporary impairment (“OTTI”) losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income.
[2] | Includes approximately $0.1 million of OTTI related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income.

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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