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Investments - Securities In Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 391,108 | $ 2,026,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 339,648 | 1,554,704
Total | 730,756 | 3,580,897
Less Than 12 Months | (4,911) | (28,520)
12 Months or Greater | (3,475) | (49,384)
Total | (8,386) | (77,904)
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 25,284 | 23,710
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,364 | 69,146
Total | 32,648 | 92,856
Less Than 12 Months | (48) | (15)
12 Months or Greater | (27) | (1,061)
Total | (75) | (1,076)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,965 | 316,655
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10,007 | 358,086
Total | 14,972 | 674,741
Less Than 12 Months | (467) | (3,875)
12 Months or Greater | (27) | (7,110)
Total | (494) | (10,985)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 135,541 | 1,272,279
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 78,842 | 785,627
Total | 214,383 | 2,057,906
Less Than 12 Months | (2,818) | (18,130)
12 Months or Greater | (333) | (22,384)
Total | (3,151) | (40,514)
Asset backed securities (“ABS”) |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,998 | 51,324
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Total | 8,998 | 51,324
Less Than 12 Months | (65) | (146)
12 Months or Greater | 0 | 0
Total | (65) | (146)
Residential mortgage backed securities (“RMBS”) |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 47,166 | 24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 116,534 | 178,573
Total | 163,700 | 178,597
Less Than 12 Months | (309) | 0
12 Months or Greater | (2,354) | (10,309)
Total | (2,663) | (10,309)
Commercial mortgage backed securities (“CMBS”) |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 21,882 | 65,704
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,579 | 163,272
Total | 35,461 | 228,976
Less Than 12 Months | (196) | (1,060)
12 Months or Greater | (70) | (8,520)
Total | (266) | (9,580)
Collateralized loan obligations (“CLOs”) |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 147,272 | 296,497
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 113,322 | 0
Total | 260,594 | 296,497
Less Than 12 Months | (1,008) | (5,294)
12 Months or Greater | (664) | 0
Total | $ (1,672) | $ (5,294)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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