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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 815,647 | $ 828,336
Allowance for Expected Credit Losses | (186) | 0
Gross Unrealized Gains | 5,465 | 27,973
Gross Unrealized Losses | (1,065) | (1,025)
Fair Value | 819,861 | 855,284
U.S. government obligations and agencies [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 59,529 | 53,688
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 157 | 864
Gross Unrealized Losses | (55) | (188)
Fair Value | 59,631 | 54,364
Corporate bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 416,758 | 457,180
Allowance for Expected Credit Losses | (148) |
Gross Unrealized Gains | 3,571 | 19,179
Gross Unrealized Losses | (337) | (141)
Fair Value | 419,844 | 476,218
Mortgage-backed and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 319,377 | 304,285
Fair Value | 319,937 | 311,079
Mortgage-backed and asset-backed securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 319,377 | 304,285
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 1,175 | 7,400
Gross Unrealized Losses | (615) | (606)
Fair Value | 319,937 | 311,079
Municipal bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 11,990 | 3,397
Allowance for Expected Credit Losses | 0 |
Gross Unrealized Gains | 138 | 103
Gross Unrealized Losses | 0 | (4)
Fair Value | 12,128 | 3,496
Redeemable preferred stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for Expected Credit Losses | (38) | 0
Redeemable preferred stock [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,993 | 9,786
Allowance for Expected Credit Losses | (38) |
Gross Unrealized Gains | 424 | 427
Gross Unrealized Losses | (58) | (86)
Fair Value | $ 8,321 | $ 10,127

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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