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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

X

- 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).

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