NONCONTROLLING INTERESTS - Distributions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Noncontrolling Interest
Distributions paid by consolidated partnership to noncontrolling interests	$ 19,810	$ 30,388
SGP
Noncontrolling Interest
Distributions paid by consolidated partnership to noncontrolling interests	9	18
Non-Affiliates (ARLP's non-affiliate limited partners)
Noncontrolling Interest
Distributions paid by consolidated partnership to noncontrolling interests	$ 19,801	$ 30,370