Financial Instruments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Financial Instruments and Fair Value Measurements

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

The financial instruments measured at fair value on a recurring basis are as follows:

	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

	December 31, 2019
							Total Fair
	Level 1		Level 2		Level 3		Value
Cash equivalents:
Money market funds	$	21,043	$	—	$	—	$	21,043
Commercial paper		138,220		—		—		138,220
U.S. Treasury Bills		6,990		—		—		6,990
		166,253		—		—		166,253
Investments - debt securities:
Corporate debt securities		—		53		—		53
		—		53		—		53
Investments - equity securities:
Preferred stock		—		9,746		—		9,746
		—		9,746		—		9,746
Restricted investments:
Short-term bond		2,250		—		—		2,250
Money market fund		114		—		—		114
		2,364		—		—		2,364
	$	168,617	$	9,799	$	—	$	178,416

Schedule of Liabilities Measured at Fair Value on Recurring Basis

		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

		December 31, 2019
	Location in							Total Fair
	Balance Sheet	Level 1		Level 2		Level 3		Value
Derivative Liabilities:
Interest rate swap	Other liabilities	$	—	$	336	$	—	$	336
		$	—	$	336	$	—	$	336

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

	December 31, 2020					December 31, 2019
	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	$	5,759	$	6,363	1	$	6,382	$	6,712	1
Liabilities
Debt
Fixed-rate debt	$	114,125	$	116,509	2	$	89,969	$	92,276	2
Variable-rate debt		47,293		47,293	2		4,538		4,538	2
Total debt	$	161,418	$	163,802		$	94,507	$	96,814
Senior Notes held by SPE	$	177,289	$	216,363	3	$	177,026	$	204,347	3