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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 840,646 | $ 828,336
Allowance for Expected Credit Losses | (470) | 0
Gross Unrealized Gains | 4,914 | 27,973
Gross Unrealized Losses | (2,516) | (1,025)
Fair Value | 842,574 | 855,284
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 135,087 | 53,688
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 247 | 864
Gross Unrealized Losses | (6) | (188)
Fair Value | 135,328 | 54,364
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 436,033 | 457,180
Allowance for Expected Credit Losses | (412) |
Gross Unrealized Gains | 2,014 | 19,179
Gross Unrealized Losses | (1,937) | (141)
Fair Value | 435,698 | 476,218
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 251,199 | 304,285
Fair Value | 253,002 | 311,079
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 251,199 | 304,285
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 2,299 | 7,400
Gross Unrealized Losses | (496) | (606)
Fair Value | 253,002 | 311,079
Municipal Bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,086 | 3,397
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 53 | 103
Gross Unrealized Losses | 0 | (4)
Fair Value | 7,139 | 3,496
Redeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for Expected Credit Losses | (58) | 0
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 11,241 | 9,786
Allowance for Expected Credit Losses | (58) |
Gross Unrealized Gains | 301 | 427
Gross Unrealized Losses | (77) | (86)
Fair Value | $ 11,407 | $ 10,127

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