NONCONTROLLING INTERESTS - Distributions (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Noncontrolling Interest
Distributions paid by consolidated partnership to noncontrolling interests	$ 62,143	$ 69,680
SGP
Noncontrolling Interest
Distributions paid by consolidated partnership to noncontrolling interests	23	38
Non-Affiliates (ARLP's non-affiliate limited partners)
Noncontrolling Interest
Distributions paid by consolidated partnership to noncontrolling interests	$ 62,120	$ 69,642