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ACQUISITION OF TRANSTAR, LLC. - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jul. 28, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 257,137   $ 122,735
Transtar      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 8,918  
Accounts receivable, net   18,625  
Operating lease right-of-use assets, net   12,231  
Property, plant and equipment, net   490,561  
Intangible assets, net   60,000  
Other assets   15,008  
Total assets   605,343  
Accounts payable and accrued liabilities   47,010  
Operating lease liabilities   10,689  
Pension and other postretirement benefits (1)   37,552  
Other liabilities   8,487  
Total liabilities   103,738  
Goodwill   134,402  
Total purchase consideration   $ 636,007