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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, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
CASH FLOWS FROM OPERATING ACTIVITIES	$ 400,645	$ 514,895	$ 694,345
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions paid to Partners	(51,753)	(278,425)	(275,902)
Net cash used in financing activities	(256,429)	(234,447)	(211,702)
NET CHANGE IN CASH AND CASH EQUIVALENTS	19,092	(207,668)	237,394
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	36,482	244,150	6,756
CASH AND CASH EQUIVALENTS AT END OF PERIOD	55,574	36,482	244,150
Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES:
CASH FLOWS FROM OPERATING ACTIVITIES	51,751	278,308	275,924
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions paid to Partners	(51,753)	(278,425)	(275,902)
Net cash used in financing activities	(51,753)	(278,425)	(275,902)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2)	(117)	22
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,176	2,293	2,271
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 2,174	$ 2,176	$ 2,293

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