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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 828,336 | $ 831,127
Gross Unrealized Gains | 27,973 | 1,922
Gross Unrealized Losses | (1,025) | (12,611)
Fair Value | 855,284 | 820,438
U.S. government obligations and agencies [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 53,688 | 67,435
Gross Unrealized Gains | 864 | 241
Gross Unrealized Losses | (188) | (1,039)
Fair Value | 54,364 | 66,637
Corporate bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 457,180 | 434,887
Gross Unrealized Gains | 19,179 | 714
Gross Unrealized Losses | (141) | (6,736)
Fair Value | 476,218 | 428,865
Mortgage-backed and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 304,285 | 312,840
Fair Value | 311,079 | 309,597
Mortgage-backed and asset-backed securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 304,285 | 312,840
Gross Unrealized Gains | 7,400 | 912
Gross Unrealized Losses | (606) | (4,155)
Fair Value | 311,079 | 309,597
Municipal bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,397 | 3,405
Gross Unrealized Gains | 103 | 0
Gross Unrealized Losses | (4) | (43)
Fair Value | 3,496 | 3,362
Redeemable preferred stock [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,786 | 12,560
Gross Unrealized Gains | 427 | 55
Gross Unrealized Losses | (86) | (638)
Fair Value | $ 10,127 | $ 11,977

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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=118939692&loc=d3e27161-111563 + Details
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