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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Employee Deferred Compensation Plans | The following table presents the Company’s income from investments held in employee deferred compensation trusts (in thousands):
|  | Year Ended December 31,
|  | 2021 |  |  | 2020 |  | 2019
Dividend income |  | $ | 23,719 |  |  |  | $ | 8,322 |  |  | $ | 10,425 |
Realized and unrealized gains |  | 37,359 |  |  |  | 66,866 |  |  | 44,492 |
Income from investments held in employee deferred compensation trusts |  | $ | 61,078 |  |  |  | $ | 75,188 |  |  | $ | 54,917 |
Schedule of Allocation of Plan Assets | The following table sets forth the composition of the underlying assets which comprise the Company’s deferred compensation trust assets (in thousands):
| Fair Value Measurements Using
| Balance at December 31, 2021 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |
Money market funds | $ | 66,700 |  |  | $ | 66,700 |  |  | — |  |  | — |
Mutual funds - bond | 30,750 |  |  | 30,750 |  |  | — |  |  | — |
Mutual funds - stock | 303,277 |  |  | 303,277 |  |  | — |  |  | — |
Mutual funds - blend | 94,264 |  |  | 94,264 |  |  | — |  |  | — |
| $ | 494,991 |  |  | $ | 494,991 |  |  | — |  |  | — |
| Fair Value Measurements Using
| Balance at December 31, 2020 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |
Money market funds | $ | 69,681 |  |  | $ | 69,681 |  |  | — |  |  | — |
Mutual funds - bond | 27,282 |  |  | 27,282 |  |  | — |  |  | — |
Mutual funds - stock | 234,667 |  |  | 234,667 |  |  | — |  |  | — |
Mutual funds - blend | 75,004 |  |  | 75,004 |  |  | — |  |  | — |
| $ | 406,634 |  |  | $ | 406,634 |  |  | — |  |  | — |
Accounts Receivable, Allowance for Credit Loss | The following table sets forth the activity in the allowance for credit losses from January 1, 2020, through December 31, 2021 (in thousands):
| Allowance for Credit Losses
Balance as of January 1, 2020 | $ | 23,443 |
Charges to expense | 4,200 |
Deductions | (7,906) |
Other, including translation adjustments | (120) |
Balance as of December 31, 2020 | $ | 19,617 |
Charges to expense | 9,464 |
Deductions | (6,827) |
Other, including translation adjustments | (724) |
Balance as of December 31, 2021 | $ | 21,530 |
Depreciation Expense Computed Using Straight-Line Method over Useful Lives | Depreciation is computed using the straight-line method over the following useful lives:
Computer hardware | 2 to 3 years
Computer software | 2 to 5 years
Furniture and equipment | 3 to 5 years
Leasehold improvements | Term of lease
Property and equipment consisted of the following (in thousands):
|  | December 31,
|  | 2021 |  | 2020
Computer hardware |  | $ | 157,408 |  |  | $ | 159,180 |
Computer software |  | 246,013 |  |  | 250,585 |
Furniture and equipment |  | 93,144 |  |  | 91,112 |
Leasehold improvements |  | 165,153 |  |  | 164,807 |
Property and equipment, cost |  | 661,718 |  |  | 665,684 |
Accumulated depreciation |  | (568,315) |  |  | (555,867) |
Property and equipment, net |  | $ | 93,403 |  |  | $ | 109,817 |

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