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Significant Accounting Policies - Schedule of impact of Topic 606 adoption on Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Operations data: |  |  |  |
Revenues | $ 1,247,917 | $ 1,277,439 | $ 2,133,205 | $ 2,133,372
Costs and Expenses: |  |  |  |
Direct costs | 908,941 | 942,246 | 1,774,387 | 1,795,478
Income tax expense | (88,889) | (42,028) | (91,421) | (14,934)
Net income | $ 223,954 | $ 117,098 | 395,499 | $ (3,256)
Balances Without Adoption of ASC 606 |  |  |  |
Statement of Operations data: |  |  |  |
Revenues |  |  | 2,132,707 |
Costs and Expenses: |  |  |  |
Direct costs |  |  | 1,778,729 |
Income tax expense |  |  | (91,368) |
Net income |  |  | 390,712 |
Effect of Change Higher/(Lower) | ASU 2014-09 |  |  |  |
Statement of Operations data: |  |  |  |
Revenues |  |  | 498 |
Costs and Expenses: |  |  |  |
Direct costs |  |  | (4,342) |
Income tax expense |  |  | (53) |
Net income |  |  | $ 4,787 |

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