Investments Equity Method Investments Table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments [Abstract]
Income on equity investments, net, before amortization of basis difference	$ 58,996	$ 65,037	$ 117,150	$ 116,643
Amortization of basis difference	(12,469)	(12,469)	(24,938)	(24,938)
Income on equity investments, net	$ 46,527	$ 52,568	$ 92,212	$ 91,705