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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Paid For:      
Interest $ 31,692 $ 29,274 $ 30,438
Income taxes 210 10 21
Non-Cash Activity:      
Accounts payable for purchase of property, plant and equipment 15,636 8,232 12,634
Assets acquired by capital lease   37,089 99,543
Market value of ARLP common units vested in ARLP's Long-Term Incentive Plan and Directors Deferred Compensation Plans before minimum statutory tax withholding requirements 8,149 3,642 7,389
Acquisition of businesses:      
Fair value of assets assumed, net of cash acquired   1,011 519,384
Contingent consideration     (20,907)
Settlement of pre-existing relationships     (124,379)
Previously held equity-method investment     (122,764)
Cash paid, net of cash acquired   (1,011) (74,953)
Fair value of liabilities assumed     176,381
Disposition of property, plant and equipment:      
Gain recognized $ (696) $ (76) $ (1)