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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 863,021	$ 831,127
Gross Unrealized Gains	23,006	1,922
Gross Unrealized Losses	(1,934)	(12,611)
Fair Value	884,093	820,438
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	73,073	67,435
Gross Unrealized Gains	817	241
Gross Unrealized Losses	(314)	(1,039)
Fair Value	73,576	66,637
Corporate Bonds [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	444,052	434,887
Gross Unrealized Gains	14,726	714
Gross Unrealized Losses	(335)	(6,736)
Fair Value	458,443	428,865
Mortgage-Backed and Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	329,492	312,840
Fair Value	335,423	309,597
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	329,492	312,840
Gross Unrealized Gains	7,056	912
Gross Unrealized Losses	(1,125)	(4,155)
Fair Value	335,423	309,597
Municipal Bonds [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,401	3,405
Gross Unrealized Gains	112	0
Gross Unrealized Losses	(6)	(43)
Fair Value	3,507	3,362
Redeemable Preferred Stock [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,003	12,560
Gross Unrealized Gains	295	55
Gross Unrealized Losses	(154)	(638)
Fair Value	$ 13,144	$ 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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