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Investments - Securities In Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 1,537,660 | $ 624,334
12 Months or Greater - Fair Value | 183,619 | 379,411
Total - Fair Value | 1,721,279 | 1,003,745
Less Than 12 Months - Unrealized Losses | (64,016) | (5,426)
12 Months or Greater - Unrealized Losses | (10,070) | (4,476)
Total - Unrealized Losses | (74,086) | (9,902)
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 12,558 | 57,301
12 Months or Greater - Fair Value | 0 | 5,806
Total - Fair Value | 12,558 | 63,107
Less Than 12 Months - Unrealized Losses | (21) | (200)
12 Months or Greater - Unrealized Losses | 0 | (10)
Total - Unrealized Losses | (21) | (210)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 99,354 | 74,859
12 Months or Greater - Fair Value | 2,017 | 6,957
Total - Fair Value | 101,371 | 81,816
Less Than 12 Months - Unrealized Losses | (3,255) | (847)
12 Months or Greater - Unrealized Losses | (3) | (10)
Total - Unrealized Losses | (3,258) | (857)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 1,034,108 | 221,357
12 Months or Greater - Fair Value | 907 | 43,505
Total - Fair Value | 1,035,015 | 264,862
Less Than 12 Months - Unrealized Losses | (41,208) | (2,847)
12 Months or Greater - Unrealized Losses | (127) | (161)
Total - Unrealized Losses | (41,335) | (3,008)
Asset backed securities (“ABS”) |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 64,104 | 21,542
12 Months or Greater - Fair Value | 0 | 3,851
Total - Fair Value | 64,104 | 25,393
Less Than 12 Months - Unrealized Losses | (6,311) | (118)
12 Months or Greater - Unrealized Losses | 0 | (60)
Total - Unrealized Losses | (6,311) | (178)
Residential mortgage backed securities (“RMBS”) |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 7,664 | 105,443
12 Months or Greater - Fair Value | 62,645 | 110,452
Total - Fair Value | 70,309 | 215,895
Less Than 12 Months - Unrealized Losses | (60) | (461)
12 Months or Greater - Unrealized Losses | (698) | (2,766)
Total - Unrealized Losses | (758) | (3,227)
Commercial mortgage backed securities (“CMBS”) |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 133,290 | 62,388
12 Months or Greater - Fair Value | 7,593 | 11,852
Total - Fair Value | 140,883 | 74,240
Less Than 12 Months - Unrealized Losses | (3,086) | (728)
12 Months or Greater - Unrealized Losses | (86) | (51)
Total - Unrealized Losses | (3,172) | (779)
Collateralized loan obligations (“CLOs”) |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 186,582 | 81,444
12 Months or Greater - Fair Value | 110,457 | 196,988
Total - Fair Value | 297,039 | 278,432
Less Than 12 Months - Unrealized Losses | (10,075) | (225)
12 Months or Greater - Unrealized Losses | (9,156) | (1,418)
Total - Unrealized Losses | $ (19,231) | $ (1,643)

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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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