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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
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