Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes our assets and liabilities at December 31, 2020 and 2019 that are measured at fair value on a recurring basis subsequent to initial recognition and indicates the fair value hierarchy of the valuation techniques utilized by us to determine such fair value (in thousands):


	Level	December 31, 2020	December 31, 2019
Deferred compensation plan assets	1	127,332	106,851
Available-for-sale debt securities	1	25,708	60,659
Deferred compensation plan liabilities	1	(127,332)	(106,851)
Interest rate swaps, net	2	(2,565)	(525)
Contingent purchase price liabilities	3	(54,391)	(32,089)

Change in Level 3 Fair Values of Contingent Purchase Price Liabilities

The following table summarizes the change in fair value of our contingent purchase price liabilities identified as Level 3 for the years ended December 31, 2020 and 2019 (pre-tax basis, in thousands):


	Contingent Purchase Price Liabilities
Beginning balance — January 1, 2019	$	(39,708)
Additions from business acquisitions	(10,150)
Settlement of contingent purchase price payable	19,368
Change in fair value of contingency	(865)
Change in net present value of contingency	(734)
Balance — December 31, 2019	$	(32,089)
Additions from business acquisitions	(37,617)
Settlement of contingent purchase price payable	14,686
Change in fair value of contingency	1,396
Change in net present value of contingency	(767)
Balance — December 31, 2020	$	(54,391)