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SEGMENT REPORTING - Other Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Depreciation expense $ 1,786,218 $ 2,027,413 $ 1,878,929
Amortization expense and other non-cash charges, net 123,500 207,746 195,328
Interest expense (income) 213,892 261,342 241,381
Capital expenditures paid 1,941,409 1,146,521 3,735,174
Total assets 13,834,323 12,931,954 14,475,334
Operating Segments | FMS      
Segment Reporting Information [Line Items]      
Depreciation expense 1,735,729 1,981,426 1,825,816
Amortization expense and other non-cash charges, net 40,771 135,499 128,322
Interest expense (income) 214,034 255,264 243,406
Capital expenditures paid 1,853,419 1,089,773 3,643,573
Total assets 10,999,687 11,274,450 12,991,716
Operating Segments | SCS      
Segment Reporting Information [Line Items]      
Depreciation expense 46,704 38,652 42,428
Amortization expense and other non-cash charges, net 84,163 68,878 61,419
Interest expense (income) 2,720 602 1,038
Capital expenditures paid 67,319 37,742 49,421
Total assets 2,320,154 1,313,312 1,236,589
Operating Segments | DTS      
Segment Reporting Information [Line Items]      
Depreciation expense 3,230 2,955 3,795
Amortization expense and other non-cash charges, net 3,108 1,025 1,510
Interest expense (income) (2,820) (3,176) (3,224)
Capital expenditures paid 1,240 1,459 2,182
Total assets 318,095 295,738 327,384
CSS      
Segment Reporting Information [Line Items]      
Depreciation expense 555 4,380 6,890
Amortization expense and other non-cash charges, net (4,542) 2,344 4,077
Interest expense (income) (42) 8,652 161
Capital expenditures paid 19,431 17,547 39,998
Total assets 554,436 328,329 305,631
Depreciation expense reallocated to segments 26,000 27,000 27,000
Eliminations      
Segment Reporting Information [Line Items]      
Depreciation expense 0 0 0
Amortization expense and other non-cash charges, net 0 0 0
Interest expense (income) 0 0 0
Capital expenditures paid 0 0 0
Total assets $ (358,049) $ (279,875) $ (385,986)