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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 819,166 | $ 828,336
Allowance for Expected Credit Losses | (455) | 0
Gross Unrealized Gains | 52,085 | 27,973
Gross Unrealized Losses | (1,378) | (1,025)
Fair Value | 869,418 | 855,284
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 53,762 | 53,688
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 2,766 | 864
Gross Unrealized Losses | (7) | (188)
Fair Value | 56,521 | 54,364
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 457,532 | 457,180
Allowance for Expected Credit Losses | (313) |
Gross Unrealized Gains | 35,008 | 19,179
Gross Unrealized Losses | (864) | (141)
Fair Value | 491,363 | 476,218
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 295,075 | 304,285
Fair Value | 308,718 | 311,079
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 295,075 | 304,285
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 13,959 | 7,400
Gross Unrealized Losses | (316) | (606)
Fair Value | 308,718 | 311,079
Municipal Bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,113 | 3,397
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 161 | 103
Gross Unrealized Losses | 0 | (4)
Fair Value | 3,274 | 3,496
Redeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for Expected Credit Losses | (142) | 0
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,684 | 9,786
Allowance for Expected Credit Losses | (142) |
Gross Unrealized Gains | 191 | 427
Gross Unrealized Losses | (191) | (86)
Fair Value | $ 9,542 | $ 10,127

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