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Depreciation and Amortization (Tables) | 12 Months Ended
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Dec. 31, 2020
Depreciation And Amortization [Abstract] |
Depreciation and Amortization Expense Excluded from Operating Expenses in its Consolidated Statements of Income and Comprehensive Income | The amounts of depreciation and amortization expense excluded from the following operating expenses in its Consolidated Statements of Income and Comprehensive Income are:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Direct expenses |  | $ | 236,054 |  |  | $ | 235,544 |  |  | $ | 212,585 |
General and administrative expenses |  |  | 4,996 |  |  |  | 4,416 |  |  |  | 4,134 |
Corporate expenses |  |  | 10,246 |  |  |  | 10,068 |  |  |  | 8,542 |
|  | $ | 251,296 |  |  | $ | 250,028 |  |  | $ | 225,261 |

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