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Fair Value Measurements
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS
The following table summarizes our assets and (liabilities) at September 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):
LevelSeptember 30, 2021December 31, 2020
Deferred compensation plan assets1$136,059 $127,332 
Available-for-sale debt securities128,455 25,708 
Other depository assets14,834 — 
Deferred compensation plan liabilities1(136,059)(127,332)
Interest rate swaps2(786)(2,565)
Contingent purchase price liabilities3(84,628)(54,391)

During the nine months ended September 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 nine months ended September 30, 2021 and 2020 (pre-tax basis) (in thousands):
20212020
Beginning balance – January 1$(54,391)$(32,089)
Additions from business acquisitions(38,149)(14,953)
Settlement of contingent purchase price liabilities9,511 12,854 
Change in fair value of contingencies(336)612 
Change in net present value of contingencies(1,263)(532)
Ending balance – September 30$(84,628)$(34,108)

Contingent purchase price liabilities result from our business acquisitions and are recorded at fair value at the time of acquisition and are presented as “Contingent purchase price liabilities — current” and “Contingent purchase price liabilities — non-current” in the accompanying Condensed Consolidated Balance Sheets. We estimate the fair value of our contingent purchase price liabilities using a probability-weighted discounted cash flow model. This fair value measure is based on significant inputs not observed in the market and thus represents a Level 3 measurement. Fair value measurements characterized within Level 3 of the fair value hierarchy are measured based on unobservable inputs that are supported by little or no market activity and reflect our own assumptions in measuring fair value.
We probability weight risk-adjusted estimates of future performance of acquired businesses, then calculate the contingent purchase price based on the estimates and discount them to present value representing management’s best estimate of fair value. The fair value of the contingent purchase price liabilities is reassessed quarterly based on assumptions provided by practice group leaders and
business unit controllers together with our corporate finance department. Any change in the fair value estimate is recorded in the earnings of that period. Refer to Note 11, Business Combinations, for further discussion of our acquisitions and contingent purchase price liabilities.
The carrying amounts of our cash and cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturity of these instruments, and the carrying value of bank debt approximates fair value as the interest rate on the bank debt is variable and approximates current market rates. As a result, the fair value measurement of our bank debt is considered to be Level 2.