Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

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

The following table summarizes our assets and (liabilities) at June 30, 2021 and December 31, 2020, respectively, 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	June 30, 2021		December 31, 2020
Deferred compensation plan assets	1	$	142,330	$	127,332
Available-for-sale debt securities	1	26,017		25,708
Deferred compensation plan liabilities	1	(142,330)		(127,332)
Interest rate swaps	2	(1,151)		(2,565)
Contingent purchase price liabilities	3	(66,187)		(54,391)

Change in Level 3 Fair Values of Contingent Purchase Price Liabilities

During the six months ended June 30, 2021 and 2020, there were no transfers between the valuation hierarchy Levels 1, 2 and 3. The following table summarizes the change in Level 3 fair values of our contingent purchase price liabilities for the six months ended June 30, 2021 and 2020 (pre-tax basis) (in thousands):

	2021		2020
Beginning balance – January 1	$	(54,391)	$	(32,089)
Additions from business acquisitions	(20,124)		(3,385)
Settlement of contingent purchase price liabilities	9,081		7,859
Change in fair value of contingencies	17		497
Change in net present value of contingencies	(770)		(343)
Ending balance – June 30	$	(66,187)	$	(27,461)