Equity Investees (Consolidated Financial Statements Related to Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Genesis’ share of operating earnings	$ 14,174	$ 18,312	$ 56,801	$ 52,834
Amortization of excess purchase price	(3,873)	(3,873)	(11,618)	(11,618)
Net equity in earnings	10,301	14,439	45,183	41,216
Distributions received	$ 17,443	$ 16,757	$ 68,873	$ 55,716