Financial Instruments and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Financial Instruments and Fair Value Measurements

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

	September 30, 2020
							Total Fair
	Level 1		Level 2		Level 3		Value
Cash equivalents:
Money market funds	$	83,960	$	—	$	—	$	83,960
		83,960		—		—		83,960
Investments - debt securities:
U.S. Treasury Bills		49,975		—		—		49,975
Corporate debt securities		—		60		—		60
		49,975		60		—		50,035
Investments - equity securities:
Preferred stock		—		2,677		—		2,677
		—		2,677		—		2,677
Restricted investments:
Short-term bond		1,180		—		—		1,180
		1,180		—		—		1,180
	$	135,115	$	2,737	$	—	$	137,852

	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

		September 30, 2020
	Location in							Total Fair
	Balance Sheet	Level 1		Level 2		Level 3		Value
Derivative Liabilities:
Interest rate swap	Other liabilities	$	—	$	1,201	$	—	$	1,201
Interest rate swap - unconsolidated affiliate	Investment in unconsolidated joint ventures		—		843		—		843
		$	—	$	2,044	$	—	$	2,044

		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

	September 30, 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	$	5,718	$	6,375	1	$	6,382	$	6,712	1
Liabilities
Debt
Fixed-rate debt	$	107,916	$	117,791	2	$	89,969	$	92,276	2
Variable-rate debt		37,843		37,843	2		4,538		4,538	2
Total debt	$	145,759	$	155,634		$	94,507	$	96,814
Senior Notes held by SPE	$	177,222	$	219,370	3	$	177,026	$	204,347	3