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OPERATING SEGMENT DATA - Capital expenditures, depreciation and amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
OPERATING SEGMENT DATA |  |  |
CAPITAL EXPENDITURES, GROSS | $ 303,817 | $ 252,411 | $ 229,209
DEPRECIATION AND AMORTIZATION EXPENSE | 149,087 | 145,349 | 138,159
Amortization of intangibles | 12,822 | 12,829 | 12,920
Research and development costs | 34,100 | 52,400 | 40,800
Other and eliminations |  |  |
OPERATING SEGMENT DATA |  |  |
CAPITAL EXPENDITURES, GROSS | 60,913 | 37,752 | 77,720
DEPRECIATION AND AMORTIZATION EXPENSE | 19,004 | 20,814 | 20,107
Assets acquired through notes payable |  |  | 3,400
Other and eliminations | Service center |  |  |
OPERATING SEGMENT DATA |  |  |
CAPITAL EXPENDITURES, GROSS |  |  | 37,500
Asset-Based | Operating Segments |  |  |
OPERATING SEGMENT DATA |  |  |
CAPITAL EXPENDITURES, GROSS | 239,842 | 207,072 | 137,117
DEPRECIATION AND AMORTIZATION EXPENSE | 110,021 | 104,165 | 97,322
Assets acquired through notes payable | 80,700 | 33,500 | 79,000
Asset-Light | Operating Segments |  |  |
OPERATING SEGMENT DATA |  |  |
CAPITAL EXPENDITURES, GROSS | 3,062 | 7,587 | 14,372
DEPRECIATION AND AMORTIZATION EXPENSE | 20,062 | 20,370 | 20,730
Amortization of intangibles | $ 12,800 | $ 12,800 | $ 12,900

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