Equity Investees (Consolidated Financial Statements Related to Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Genesis’ share of operating earnings	$ 15,703	$ 13,364	$ 51,491	$ 40,144
Amortization of excess purchase price	(3,873)	(3,872)	(11,618)	(11,756)
Net equity in earnings	11,830	9,492	39,873	28,388
Distributions received	$ 19,512	$ 17,044	$ 58,058	$ 55,034