Financial Instruments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Financial Instruments and Fair Value Measurements

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

	March 31, 2021
							Total Fair
	Level 1		Level 2		Level 3		Value
Cash equivalents:
Money market funds	$	17,049	$	—	$	—	$	17,049
U.S. Treasury Bills		16,000		—		—		16,000
		33,049		—		—		33,049
Investments - debt securities:
U.S. Treasury Bills		93,974		—		—		93,974
		93,974		—		—		93,974
Investments - equity securities:
Preferred stock		—		1,589		—		1,589
		—		1,589		—		1,589
	$	127,023	$	1,589	$	—	$	128,612

	December 31, 2020
							Total Fair
	Level 1		Level 2		Level 3		Value
Cash equivalents:
Money market funds	$	10,973	$	—	$	—	$	10,973
U.S. Treasury Bills		78,991		—		—		78,991
		89,964		—		—		89,964
Investments - debt securities:
U.S. Treasury Bills		47,991		—		—		47,991
Corporate debt securities		—		60		—		60
		47,991		60		—		48,051
Investments - equity securities:
Preferred stock		—		2,623		—		2,623
		—		2,623		—		2,623
Restricted investments:
Short-term bond		1,171		—		—		1,171
		1,171		—		—		1,171
	$	139,126	$	2,683	$	—	$	141,809

Schedule of Liabilities Measured at Fair Value on Recurring Basis

		March 31, 2021
	Location in							Total Fair
	Balance Sheet	Level 1		Level 2		Level 3		Value
Derivative Liabilities:
Interest rate swap	Other liabilities	$	—	$	1,015	$	—	$	1,015
Interest rate swap - unconsolidated affiliate	Investment in unconsolidated joint ventures		—		610		—		610
		$	—	$	1,625	$	—	$	1,625

		December 31, 2020
	Location in							Total Fair
	Balance Sheet	Level 1		Level 2		Level 3		Value
Derivative Liabilities:
Interest rate swap	Other liabilities	$	—	$	1,172	$	—	$	1,172
Interest rate swap - unconsolidated affiliate	Investment in unconsolidated joint ventures		—		821		—		821
		$	—	$	1,993	$	—	$	1,993

Schedule of Carrying Amount and Fair Value Measured on Nonrecurring Basis of Financial Instruments

	March 31, 2021					December 31, 2020
	Carrying		Estimated			Carrying		Estimated
	value		Fair value		Level	value		Fair value		Level
Assets
Investments held by SPEs:
Time deposit	$	200,000	$	200,000	3	$	200,000	$	200,000	3
U.S. Treasury Bills	$	5,389	$	5,832	1	$	5,759	$	6,363	1
Liabilities
Debt
Fixed-rate debt	$	117,668	$	118,219	2	$	114,125	$	116,509	2
Variable-rate debt		54,641		54,641	2		47,293		47,293	2
Total debt	$	172,309	$	172,860		$	161,418	$	163,802
Senior Notes held by SPE	$	177,357	$	205,171	3	$	177,289	$	216,363	3