Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Summary of Asset and Liability Fair Values

The table below summarizes certain asset and liability fair values that are included within our accompanying Condensed Consolidated Balance Sheets, and their designations among the three fair value measurement categories (see Note 2(x)):

	June 30, 2020 Fair Value Measurements
	Level 1		Level 2		Level 3		Total
Assets:
Government-related debt securities	$	20,293	$	—	$	—	$	20,293
Corporate debt securities	—		19,739		—		19,739
Money market funds	83,987		—		—		83,987
Equity securities (Note 7)	23,085		—		—		23,085
Bank CDs	—		4,161		—		4,161
Mutual funds	4,112		9		—		4,121
Key employee life insurance, cash surrender value	—		3,484		—		3,484		*
	$	131,477	$	27,393	$	—	$	158,870
Liabilities:
Deferred executive compensation liability (Note 8(f))	$	—	$	7,582	$	—	$	7,582	*
	$	—	$	7,582	$	—	$	7,582

	December 31, 2019 Fair Value Measurements
	Level 1		Level 2		Level 3		Total
Assets:
Government-related debt securities	$	47,636	$	14,990	$	—	$	62,626
Corporate debt securities	—		58,248		—		58,248
Money market funds	54,199		—		—		54,199
Equity securities (Note 7)	31,047		—		—		31,047
Bank CDs	—		7,376		—		7,376
Mutual funds	5,158		11		—		5,169
Key employee life insurance, cash surrender value	—		3,547		—		3,547		*
	$	138,040	$	84,172	$	—	$	222,212
Liabilities:
Deferred executive compensation liability (Note 8(f))	$	—	$	8,746	$	—	$	8,746	*
	$	—	$	8,746	$	—	$	8,746

* The reported amount of “key employee life insurance, cash surrender value” is based on the stated cash surrender value of life insurance policies of named current and former employees at each period-end. The reported amount of “deferred executive compensation liability” is based on the period-end market value of mutual fund investments selected by employee participants of the deferred compensation plan.