Fair Value (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value [Abstract]

Fair Value, Assets Measured on Recurring Basis

The following table presents for each of the fair value hierarchy levels, our assets that are measured at fair value on a recurring basis at December 31, 2020 and December 31, 2019 (in thousands).

	As of December 31, 2020
	Quoted Prices in
	Active Markets for
	Identical Assets		Other Observable		Unobservable
	(Level 1)		Inputs (Level 2)		Inputs (Level 3)		Total
U.S. Treasury securities and obligations of U.S. Government	$	—	$	179,746	$	—	$	179,746
Corporate bonds		—		219,020		348		219,368
Corporate bank loans		—		52,782		—		52,782
Municipal bonds		—		50,539		—		50,539
Mortgage-backed		—		4,844		—		4,844
Total debt securities		—		506,931		348		507,279
Total equity securities		29,388		—		—		29,388
Total other investments		—		—		—		—
Total investments	$	29,388	$	506,931	$	348	$	536,667

	As of December 31, 2019
	Quoted Prices in
	Active Markets for
	Identical Assets		Other Observable		Unobservable
	(Level 1)		Inputs (Level 2)		Inputs (Level 3)		Total
U.S. Treasury securities and obligations of U.S. Government	$	—	$	66,600	$	—	$	66,600
Corporate bonds		—		300,486		339		300,825
Corporate bank loans		—		115,757		—		115,757
Municipal bonds		—		83,270		—		83,270
Mortgage-backed		—		7,827		—		7,827
Total debt securities		—		573,940		339		574,279
Total equity securities		99,215		—		—		99,215
Total other investments		2,169		—		—		2,169
Total investments	$	101,384	$	573,940	$	339	$	675,663

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following table summarizes the changes in fair value for all financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the year ended December 31, 2020 and 2019 (in thousands).

	2020		2019
Beginning balance as of January 1	$	339	$	291
Sales		—		—
Settlements		—		—
Purchases		—		—
Issuances		—		—
Total realized/unrealized gains included in net income		9		48
Net gain included in other comprehensive income		—		—
Transfers into Level 3		—		—
Transfers out of Level 3		—		—
Ending balance as of December 31	$	348	$	339