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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits | The following table presents the Company’s (income) loss from investments held in employee deferred compensation trusts (in thousands):
|  | Year Ended December 31,
|  | 2020 |  |  | 2019 |  | 2018
Dividend income |  | $ | (8,322) |  |  |  | $ | (10,425) |  |  | $ | (10,857) |
Realized and unrealized (gains) losses |  | (66,866) |  |  |  | (44,492) |  |  | 22,343 |
|  | $ | (75,188) |  |  |  | $ | (54,917) |  |  | $ | 11,486 |
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, 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 |  |  | — |  |  | — |
| Fair Value Measurements Using
| Balance at December 31, 2019 |  | 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 | $ | 141,295 |  |  | $ | 141,295 |  |  | — |  |  | — |
Mutual funds - bond | 28,451 |  |  | 28,451 |  |  | — |  |  | — |
Mutual funds - stock | 170,469 |  |  | 170,469 |  |  | — |  |  | — |
Mutual funds - blend | 58,227 |  |  | 58,227 |  |  | — |  |  | — |
| $ | 398,442 |  |  | $ | 398,442 |  |  | — |  |  | — |
Accounts Receivable, Allowance for Credit Loss | The following table sets forth the activity in the allowance for credit losses from December 31, 2019, through December 31, 2020 (in thousands):
| Allowance for Credit Losses
Balance as of December 31, 2019 | $ | 22,885 |
Adoption of accounting pronouncement | 558 |
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 |
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 3 years
Furniture and equipment | 3 to 5 years
Leasehold improvements | Term of lease
Property and equipment consisted of the following (in thousands):
|  | December 31,
|  | 2020 |  | 2019
Computer hardware |  | $ | 159,180 |  |  | $ | 164,547 |
Computer software |  | 250,585 |  |  | 291,681 |
Furniture and equipment |  | 91,112 |  |  | 88,136 |
Leasehold improvements |  | 164,807 |  |  | 150,644 |
Property and equipment, cost |  | 665,684 |  |  | 695,008 |
Accumulated depreciation |  | (555,867) |  |  | (566,623) |
Property and equipment, net |  | $ | 109,817 |  |  | $ | 128,385 |

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