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Investments - Securities In Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | $ 1,907,865 | $ 2,370,345
12 months or greater | 236,802 | 294,916
Total investment portfolio | 2,144,667 | 2,665,261
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (39,330) | (50,915)
12 months or greater | (9,443) | (9,718)
Total investment portfolio | (48,773) | (60,633)
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 51,602 | 48,642
12 months or greater | 0 | 0
Total investment portfolio | 51,602 | 48,642
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (604) | (724)
12 months or greater | 0 | 0
Total investment portfolio | (604) | (724)
Obligations of U.S. states and political subdivisions |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 830,978 | 1,136,676
12 months or greater | 22,930 | 13,681
Total investment portfolio | 853,908 | 1,150,357
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (18,391) | (24,918)
12 months or greater | (817) | (507)
Total investment portfolio | (19,208) | (25,425)
Corporate debt securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 802,288 | 915,777
12 months or greater | 34,552 | 35,769
Total investment portfolio | 836,840 | 951,546
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (12,157) | (16,771)
12 months or greater | (1,567) | (1,839)
Total investment portfolio | (13,724) | (18,610)
ABS |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 2,998 | 3,366
12 months or greater | 0 | 656
Total investment portfolio | 2,998 | 4,022
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (19) | (28)
12 months or greater | 0 | 0
Total investment portfolio | (19) | (28)
RMBS |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 46,425 | 46,493
12 months or greater | 162,729 | 171,326
Total investment portfolio | 209,154 | 217,819
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (985) | (857)
12 months or greater | (6,938) | (6,769)
Total investment portfolio | (7,923) | (7,626)
CMBS |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 165,771 | 205,545
12 months or greater | 16,453 | 38,587
Total investment portfolio | 182,224 | 244,132
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (6,994) | (7,529)
12 months or greater | (112) | (465)
Total investment portfolio | (7,106) | (7,994)
CLOs |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 7,276 | 13,278
12 months or greater | 0 | 34,760
Total investment portfolio | 7,276 | 48,038
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (168) | (73)
12 months or greater | 0 | (129)
Total investment portfolio | (168) | (202)
Equity securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 527 | 568
12 months or greater | 138 | 137
Total investment portfolio | 665 | 705
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (12) | (15)
12 months or greater | (9) | (9)
Total investment portfolio | $ (21) | $ (24)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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