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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