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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 850,658	$ 831,127
Gross Unrealized Gains	28,909	1,922
Gross Unrealized Losses	(1,000)	(12,611)
Fair Value	878,567	820,438
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	71,696	67,435
Gross Unrealized Gains	1,096	241
Gross Unrealized Losses	(206)	(1,039)
Fair Value	72,586	66,637
Corporate Bonds [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	450,868	434,887
Gross Unrealized Gains	18,628	714
Gross Unrealized Losses	(198)	(6,736)
Fair Value	469,298	428,865
Mortgage-Backed and Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313,001	312,840
Fair Value	321,134	309,597
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313,001	312,840
Gross Unrealized Gains	8,642	912
Gross Unrealized Losses	(509)	(4,155)
Fair Value	321,134	309,597
Municipal Bonds [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,399	3,405
Gross Unrealized Gains	148	0
Gross Unrealized Losses	(5)	(43)
Fair Value	3,542	3,362
Redeemable Preferred Stock [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,694	12,560
Gross Unrealized Gains	395	55
Gross Unrealized Losses	(82)	(638)
Fair Value	$ 12,007	$ 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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