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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - CONDENSED STATEMENT OF CASH FLOWS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:      
CASH FLOWS FROM OPERATING ACTIVITIES $ 425,202 $ 400,645 $ 514,895
CASH FLOWS FROM FINANCING ACTIVITIES:      
Distributions paid to Partners (52,158) (51,753) (278,425)
Net cash used in financing activities (215,685) (256,429) (234,447)
NET CHANGE IN CASH AND CASH EQUIVALENTS 66,829 19,092 (207,668)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 55,574 36,482 244,150
CASH AND CASH EQUIVALENTS AT END OF PERIOD 122,403 55,574 36,482
AHGP as the parent company      
CASH FLOWS FROM OPERATING ACTIVITIES:      
CASH FLOWS FROM OPERATING ACTIVITIES 52,157 51,751 278,308
CASH FLOWS FROM FINANCING ACTIVITIES:      
Distributions paid to Partners (52,158) (51,753) (278,425)
Net cash used in financing activities (52,158) (51,753) (278,425)
NET CHANGE IN CASH AND CASH EQUIVALENTS (1) (2) (117)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 2,174 2,176 2,293
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 2,173 $ 2,174 $ 2,176