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Fair Value Measurements (Tables) | 6 Months Ended
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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) |  |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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