SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
CASH FLOWS FROM OPERATING ACTIVITIES	$ 791,812	$ 425,202	$ 400,645
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions paid to Partners	(196,347)	(52,158)	(51,753)
Net cash used in financing activities	(214,854)	(215,685)	(256,429)
NET CHANGE IN CASH AND CASH EQUIVALENTS	173,620	66,829	19,092
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	122,403	55,574	36,482
CASH AND CASH EQUIVALENTS AT END OF PERIOD	296,023	122,403	55,574
AHGP as the parent company
CASH FLOWS FROM OPERATING ACTIVITIES:
CASH FLOWS FROM OPERATING ACTIVITIES	196,348	52,157	51,751
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions paid to Partners	(196,347)	(52,158)	(51,753)
Net cash used in financing activities	(196,347)	(52,158)	(51,753)
NET CHANGE IN CASH AND CASH EQUIVALENTS	1	(1)	(2)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,173	2,174	2,176
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 2,174	$ 2,173	$ 2,174