Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

Components of Long-Term Debt and Methods Used in Estimating Fair Values

The following table summarizes components of the Company’s long-term debt and methods used in estimating their fair values:

	Maturity Date	Valuation Methodology
4.75% Convertible Senior Notes	2042	Quoted price
4.25% Convertible Senior Notes	2037	Quoted price
3.90% Promissory Note	2032	Discounted cash flow method/Level 3 inputs
3.75% Callable Promissory Note	2036	Discounted cash flow method/Level 3 inputs
4.55% Promissory Note	2036	Discounted cash flow method/Level 3 inputs

Assets Measured at Estimated Fair Value on a Recurring Basis

The following tables present information about the Company’s financial assets measured at estimated fair value on a recurring basis. The tables indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value as of June 30, 2022 and December 31, 2021:

	Fair Value Measurements Using
	(Level 1)		(Level 2)		(Level 3)		Total
As of June 30, 2022
Financial Assets:
Cash and cash equivalents	$	360,488	$	—	$	—	$	360,488
Restricted cash	$	2,600	$	—	$	—	$	2,600
Fixed-maturity securities:
U.S. Treasury and U.S. government agencies	$	366,134	$	1,429	$	—	$	367,563
Corporate bonds		28,424		—		—		28,424
State, municipalities, and political subdivisions		—		1,767		—		1,767
Exchange-traded debt		713		—		—		713
Redeemable preferred stock		104		—		—		104
Total available-for-sale securities	$	395,375	$	3,196	$	—	$	398,571
Equity securities	$	35,719	$	—	$	—	$	35,719

	Fair Value Measurements Using
	(Level 1)		(Level 2)		(Level 3)		Total
As of December 31, 2021
Financial Assets:
Cash and cash equivalents	$	628,943	$	—	$	—	$	628,943
Restricted cash	$	2,400	$	—	$	—	$	2,400
Fixed-maturity securities:
U.S. Treasury and U.S. government agencies	$	15,536	$	1,488	$	—	$	17,024
Corporate bonds		22,492		—		—		22,492
State, municipalities, and political subdivisions		—		1,808		—		1,808
Exchange-traded debt		811		—		—		811
Redeemable preferred stock		448		—		—		448
Total available-for-sale securities	$	39,287	$	3,296	$	—	$	42,583
Equity securities	$	51,740	$	—	$	—	$	51,740

Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Consolidated Balance Sheets

The following tables present fair value information for liabilities that are carried on the consolidated balance sheets at amounts other than fair value as of June 30, 2022 and December 31, 2021:

	Carrying		Fair Value Measurements Using						Estimated
	Value		(Level 1)		(Level 2)		(Level 3)		Fair Value
As of June 30, 2022
Financial Liabilities:
Long-term debt:
4.75% Convertible Senior Notes	$	166,596	$	—	$	178,522	$	—	$	178,522
4.25% Convertible Senior Notes		23,916		—		27,143		—		27,143
3.90% Promissory Note		9,117		—		—		8,711		8,711
3.75% Callable Promissory Note		6,973		—		—		6,604		6,604
4.55% Promissory Note		5,025		—		—		4,959		4,959
Total long-term debt	$	211,627	$	—	$	205,665	$	20,274	$	225,939

	Carrying		Fair Value Measurements Using						Estimated
	Value		(Level 1)		(Level 2)		(Level 3)		Fair Value
As of December 31, 2021
Financial Liabilities:
Revolving credit facility	$	15,000	$	—	$	15,000	$	—	$	15,000
Long-term debt:
4.25% Convertible Senior Notes	$	23,885	$	—	$	33,248	$	—	$	33,248
3.90% Promissory Note		9,287		—		—		10,488		10,488
3.75% Callable Promissory Note		7,153		—		—		7,852		7,852
4.55% Promissory Note		5,148		—		—		6,051		6,051
Total long-term debt	$	45,473	$	—	$	33,248	$	24,391	$	57,639