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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment information |  |  |
Operating income (loss) | $ 1,797,467 | $ 1,633,153 | $ 1,402,939
Stock-based compensation expense | 70,500 | 70,300 | 63,400
Corporate and Unallocated |  |  |
Segment information |  |  |
Operating income (loss) | 373,913 | 348,170 | 330,741
Payroll costs | 258,600 | 234,100 | 203,300
Stock-based compensation expense | 70,300 | 69,900 | 63,400
Professional service expenses | 77,900 | 67,600 | 78,500
Insurance costs | 9,300 | 7,500 | 6,100
Other operating expenses | $ 28,100 | $ 39,000 | $ 42,800

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